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

Issue
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There is  regression issue.
Even though text is ellipsis, but it is not start marquee

Cause
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Adding marquee threshold causes mis calculation for starting marquee

Fix
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Revert previous commit.
Although that fix is for making alignment for button text, It makes a side. (More major issue)

Enyo-DCO-1.1-Signed-off-by: David Um david.um@lge.com