Adjust colors for QS footer buttons

Also refactor the footer actions viewmodel to allow for compose colors as these previously did not react to light/dark theme

Test: manually with shade and QS compose flags combinations
Test: manually in ComposeGallery
Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Flag: com.android.systemui.notification_shade_blur
Fixes: 403193068
Change-Id: I22cb9e5dd018538beafd0234f3272a5c40356d50