Fix communal widget sizing

This change ensures that each communal content, despite of its type, is
given the correct available space through modifiers. It particularly
fixes an issue where widgets are not rendered at the correct size.

Bug: 324297118
Fix: 324297118
Test: see an hsv in bug
Flag: ACONFIG com.android.systemui.communal_hub STAGING
Change-Id: I7863e484e38e1d9a937fcf8d94fd28454c769f1c