[ActivityManager] Reset ActivityRecord's waitingVisible

Symptom:
The ActivityRecord's waitingVisible is not set to false for
all cases when the ActivityRecord is removed from
mStackSupervisor.mWaitingVisibleActivities.

Solution:
Set the waitingVisible to false when it is removed from
mStackSupervisor.mWaitingVisibleActivities

Change-Id: If0f0683971d70a6866b0167e91dd95feebaac178
Correct a mistyped word "MSG_SET_CLEINT" to "MSG_SET_CLIENT"

"MSG_SET_CLEINT" is mistyped, so correct it.

Change-Id: Ib5eeaf7071e95db8b2375ca09d10420a5a445543