Fix messages database upgrade issues

[daniele-athome]

This is because the constants used for create table columns are shared among database versions queries. This is wrong: convert all static constants to full string contacts.

java.lang.RuntimeException: Unable to create application org.kontalk.Kontalk: android.database.sqlite.SQLiteException: table threads_new has 17 columns but 15 values were supplied (code 1): , while compiling: INSERT INTO threads_new SELECT _id, msg_id, SUBSTR(peer, 1, ?) || '@' || ?, direction, count, unread, 0, 'text/plain', content, timestamp, status_changed, status, 0, draft, 0 FROM threads
       at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4469)
       at android.app.ActivityThread.access$1500(ActivityThread.java:144)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:136)
       at android.app.ActivityThread.main(ActivityThread.java:5139)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:515)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
       at dalvik.system.NativeStart.main(NativeStart.java)
Caused by android.database.sqlite.SQLiteException: table threads_new has 17 columns but 15 values were supplied (code 1): , while compiling: INSERT INTO threads_new SELECT _id, msg_id, SUBSTR(peer, 1, ?) || '@' || ?, direction, count, unread, 0, 'text/plain', content, timestamp, status_changed, status, 0, draft, 0 FROM threads
       at android.database.sqlite.SQLiteConnection.nativePrepareStatement(SQLiteConnection.java)
       at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
       at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
       at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
       at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
       at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
       at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1672)
       at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1653)
       at org.kontalk.provider.MessagesProvider$DatabaseHelper.onUpgrade(MessagesProvider.java:414)
       at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:257)
       at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188)
       at org.kontalk.provider.MessagesProvider.query(MessagesProvider.java:575)
       at android.content.ContentProvider.query(ContentProvider.java:857)
       at android.content.ContentProvider$Transport.query(ContentProvider.java:200)
       at android.content.ContentResolver.query(ContentResolver.java:461)
       at android.content.ContentResolver.query(ContentResolver.java:404)
       at org.kontalk.ui.MessagingNotification.updateMessagesNotification(MessagingNotification.java:224)
       at org.kontalk.Kontalk.onCreate(Kontalk.java:194)
       at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1007)
       at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4466)
       at android.app.ActivityThread.access$1500(ActivityThread.java:144)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:136)
       at android.app.ActivityThread.main(ActivityThread.java:5139)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:515)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
       at dalvik.system.NativeStart.main(NativeStart.java)