[QSDetailedView] Fix the cast list in the details scrollable column

Previously, the Android view was measured to a 0 height view,
preventing the content from being displayed.

Bug: 378513588
Flag: com.android.systemui.qs_tile_detailed_view
Test: Only fix the UI. Existing unit tests still pass.
Change-Id: I41d005244cd41d74b6421aff98415466aaea778b