Fix value for legacy_listing_summary

Its previous string value contradicts its behaviour - Amaze will use old method (ls) to list files when preference PreferenceConstants.PREFERENCE_ROOT_LEGACY_LISTING is true, while the translation string reads contradictory meaning.

app/src/main/res/values/strings.xml

@@ -696,7 +696,7 @@
     <string name="clear_open_file_summary">Clears selected default file opening apps</string>
     <string name="ftp_readonly">Read-only access</string>
     <string name="legacy_listing_title">Use legacy listing for root</string>
-    <string name="legacy_listing_summary">If enabled, uses stat for listing, else uses ls</string>
+    <string name="legacy_listing_summary">If enabled, uses old method (ls) for listing files, else uses stat (new method)</string>
     <string name="error_unsupported_v5_rar">RAR archive \"%s\" is unsupported RAR v5 archive.</string>
     <string name="ftp_prompt_restart_server">You will need to restart the FTP server for changes to take effect.</string>
     <string name="error_permission_denied">Permission denied</string>