Fixed button bar alignment issue in RTL languages

Buttons should be aligned opposite to English in RTL languages.

Test: 1. RTL language
      2. Create an alert dialog having positive, negative and neutral button.
      3. Check the button bar alignment
Bug: 70363698

Change-Id: I783dfdcf9cb3f85402a4ff3fa4c2d1d1caf5c3da
Signed-off-by: susanta.patra <susanta.patra@lge.com>