Revert "CMB-3553: Buttons text are left aligned in DataGridList Sample"

This reverts commit 2cc511650b0435fbd7ff1ca6485a71651a8116d4.
Merge pull request #1811 from enyojs/BHV-18827-davidum-2.5

Revert "CMB-3553: Buttons text are left aligned in DataGridList Sample" (2.5)

Integrated-By: Aaron Tam (aaron.tam@lge.com)