Update transactions.proto to sync with layer_state_t

I92ed7c4fdf09a2133efda4172e2f61f4a198e51b added
eLayerIsDisplayDecoration to layer_state_t. Update LayerState to match.

Bug: 193170859
Test: NA
Change-Id: Ib8e17c71bd1fdd97b881df4251b1b53d33a144e4
1 file changed