Disable motion flag on tests for legacy hub transition animation

For tests verifying the legacy lock screen to Hub animation, ensure the
motion flag is disabled. So the flag can be rolled out to staging in
ag/34436278.

Bug: 404535174
Test: atest GlanceableHubToLockscreenTransitionViewModelTest
Test: atest LockscreenToGlanceableHubTransitionViewModelTest
Flag: com.android.systemui.gesture_between_hub_and_lockscreen_motion
Change-Id: Ide771ec41f294e96877a177b121b9b0c53bc20ad