Settings: Correctly align cursor in Settings

Steps to Reproduce:
- Click on Density Settings (DPI Settings) / Renaming BT Device / Renaming SIM Settings
- EditText Dialog pops up
- The cursor is at the leftmost side of the text
- Logically Cursor should be at rightmost side which can be aligned grabbing text length

Screenshots:
Before:
http://imgur.com/a/o4vkr
http://imgur.com/a/6Qext

After:
http://imgur.com/a/fuxqT
http://imgur.com/a/vm2WX

Bug: 65185652
Test: RunSettingsRoboTests: OK (47 tests)

Change-Id: Id00308e7e019434edad4afab56cf4719be0d0d54
Signed-off-by: PMS22 <prathams99@rediff.com>

src/com/android/settings/display/DensityPreference.java

@@ -27,6 +27,7 @@ import android.widget.EditText;
 
 import com.android.settings.R;
 import com.android.settingslib.CustomEditTextPreference;
+import com.android.settings.Utils;
 import com.android.settingslib.display.DisplayDensityUtils;
 
 import java.text.NumberFormat;
@@ -63,6 +64,7 @@ public class DensityPreference extends CustomEditTextPreference {
         if (editText != null) {
             editText.setInputType(InputType.TYPE_CLASS_NUMBER);
             editText.setText(getCurrentSwDp() + "");
+            Utils.setEditTextCursorPosition(editText);
         }
     }