Apply gesture exclusion only when not transitionin

When we are transitioning, the layout position of the slider (or any
component) will move, and there's no need to apply gesture exclusion at
those points.

Instead only apply when transition state is idle.

Test: manual, perfetto slices MSG_SYSTEM_GESTURE_EXCLUSION_CHANGED
Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Fixes: 399979268
Change-Id: Ifd0dd9ed17040172fed63d27271967757d8c3c4d