Recent changes aligned PolyGerrit closer with the Material spec, which
moved many dialog actions from being left-aligned to right-aligned, and
with 'reverse' order.
In two cases (gr-diff-preferences and gr-reply-dialog), the focusStops
for the dialog were hardcoded to the first and last focusable DOM
elements in the dialog. When the button order was reversed, these were
not updated.
Bug: Issue 7775
Change-Id: I7faa4e49e9610f0196314a103dd4f5d6b2c1a456
eae9f56034