Fix ViewModel proguard rules
Fix ViewModel proguard rules

It removes allowshrinking modifier: a constructor
shouldn't be removed if it is unused, because it is
called through reflection

Test: manual =\
bug: 112230489
Change-Id: I215fe895fa12eb04172e9380a296e2d74567907c

AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx