Fix exception on writing Last COM Port setting to ASCOM profile (#19)

Writing the "Last COM Port" value to the ASCOM profile of the focuser
throws an exception, because the device type of the profile has not been
set to "Focuser", so it is "Telescope" by default.

This means that if auto-detecting the COM port is off in the focuser
app, the connection always fails.

The device type was being set inside an "if" clause in the code, meaning
it was never being set in the non-auto-detecting case.

ASCOM_Driver/FocuserDriver.cs

@@ -234,16 +234,14 @@ public bool Connected
 
                     Debug.Assert(objSerial == null);
 
-                    using (Profile driverProfile = new Profile())
+                    using (Profile driverProfile = new Profile() { DeviceType = "Focuser" })
                     {
                         Serial serial = null;
 
                         var comPorts = new List<string>(System.IO.Ports.SerialPort.GetPortNames());
 
                         if (autoDetectComPort)
                         {
-                            driverProfile.DeviceType = "Focuser";
-
                             // See if the last successfully connected COM port can be used first...
                             // This is a performance optimization that significantly reduces the time it takes to connect!
                             string lastComPort = driverProfile.GetValue(driverID, lastComPortProfileName, string.Empty, string.Empty);