Enforce falsing for long press and double tap.

These checks already exists without the flag at the call sites, but
with flag they are composables so having the checks here makes it
easier to inject the falsing manager.

In the specific instance of the linked bug, by checking for false
long press we create a history of prior results rather than
defaulting to false for the menu button tap.

Fix: 432657748
Flag: com.android.systemui.scene_container
Test: atest KeyguardTouchHandlingViewModelTest + manual (see video in the bug)
Change-Id: Ibba6f91afc4c5995c0c14c0fec3d858ee4ed84dd