[SB][Chips] Re-calculate chip timer minWidth when font size changes.

When the font size decreases, our chip should probably take less room,
so update the NeverDecreaseWidth Modifier to reset the minimum whenever
the density changes.

Fixes: 395607413
Bug: 372657935
Flag: com.android.systemui.status_bar_chips_modernization

Test: Trigger screen share chip, then increase then decrease font size
-> verify chip isn't too wide
Test: Trigger phone call chip, then increase then decrease font size ->
verify chip isn't too wide

Change-Id: I8818436e855c486ea3918e8b0d9dc21ef2e83c5c