[SB][Chips] Enable isHidden field for all call chips

Previously the isHidden field has only been in use if
status_bar_chips_return_animations have been enabled.
This change utilizes this field when that flag is disabled.

Test: CallChipViewModelTest
Test: manually confirm chip behavior unchanged
Bug: 427747840
Flag: com.android.systemui.status_bar_call_chip_use_is_hidden

Change-Id: I7d8a28918e7b6c2d9f713600a0c588f7d3cfe429