Delete ShadeFullExpansionListener

I squashed ag/25058951 into this hoping that the further cleanups
to the lifecycle of StatusBarStateControllerImpl would resolve the
possible regression to OnlyShowNewNotificationsOnLockscreen. I can't
be sure that this resolved any issues, but the test passes on both
real and emulated devices with this change.

Fixes: 300243163
Test: updated existing tests
Test: manual
Test: verified OnlyShowNewNotificationsOnLockscreen locally on phone and tablet and remotely on cuttlefish https://android-build.corp.google.com/abtd/run/L14100000963602695
Change-Id: I4c24cc008f3bdaf622b72c4279c1ba37a9676e58