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>