Only disallow QS expansion while keyboard is visible

Currently, a bug makes isRemoteInput sometimes returns true when
there is no remote input. In order to reduce the impact of the
bug, we will also require the keyboard to be visible to block QS
expansion. This will allow users to dismiss the keyboard then
expand QS while the input has the focus, but this is an
acceptable tradeoff while the root cause is being addressed.

Bug: 276357074
Test: manually checked go/shade-cujs and ran atest
Change-Id: I291ea25c45297820032dec10d81fe88e4159bea6