BufferStateLayer: shouldPresentNow is always true

This method should actually be removed because we do the checking
at the transaction queue level now, but we leave it for now for
BufferQueueLayer. To show the method should always return true
we can examine each clause in the method:
	1. isVsyncValidForUid: We were supposed to check this at
	transaction queue, if for some reason this returned false
	now we just need to continue.
	2. getSideBandStream/AutoRefresh, covered by the call to
	layer->hasReadyFrame which encloses the only call to
	layer->shouldPresentNow
	3. hasFrameUpdate, also called by layer->hasReadyFrame
	4. isBufferDue, supposed to be handled by the transaction
	queue, mismatch not allowed at this point.
Just landing this to simplify debugging around this codepath.

Bug: 180194022
Test: Existing tests pass
Change-Id: I1a5eb572a3e651a2504039ef9cc8e3b51a46dd3c