Fix cropped folder name text in arabic

Centralize the folder name within folder footer using gravity property
instead of adding padding to the folder name view. Padding as calculated
was cropping the folder name to the text line height, which was
insuficient in some cases, as eveidenced by the linked bug.

Bug: b/358006967
Test: Open a folder on home screen with arabic system language.
      Verify that the folder name displays correctly.
Flag: EXEMPT bugfix

Change-Id: I4436c224f7f6541f447e3a5354ff870cf4d50698