Fixes A11yMenu Settings title bar cutoff for largest font sizes.

The ActionBar in a standard preference page uses a hardcoded size that
isn't friendly to large font size, so this change grabs the action bar
and its parent and sets WRAP_CONTENT for their height so that they grow
to accomodate the height of the TextView.

Bug: 347911378
Flag: com.android.systemui.accessibility.accessibilitymenu.action_bar_wrap_content
Test: See bug for screenshots
Change-Id: I0a6f7d6be8641983890d6d5471a89ff51194d996