Add margins to KQS view that is triggered from transient taskbar

This cl adds additional bottom margins to the KQS view for the
transient taskbar. Also adds a behavior that when the KQS view is
showing, the transient taskbar won't be stashed.

Screenshots with the new layout after this cl is uploaded to the
buganizer.

Bug: 368119679
Test: open KQS via transient taskbar and observe the bounds change
Flag: com.android.launcher3.taskbar_overflow
Change-Id: Ie50e768f828a24f0111df4cdba474a6482a4e1c7