Revert "Revert "Update dialog background color for dark theme""

This reverts commit 77259dc9.

Previously, using a general attribute to change the background color
for alert dialog. It will also impact on the background of other
components. To fix it, we used another attribute to change the dialog
background.

Bug: 132753127
Bug: 132623454
Bug: 129993336
Test: visual
Change-Id: I09091ee8fb45238d0ea94760f2fca5c206299a57