Fix crash on hanging up simulator video call.

The problem is that InCallActivityCommon#onStop will try to commit any fragment which will crash.

This change also fix a bug that simulatorRemoteVideo is not stopped after hanging up.

Bug: 67045513
Test: manual
PiperOrigin-RevId: 170380589
Change-Id: I25e0f43141eaa573189f4d9c0109fd2689c10374
diff --git a/java/com/android/incallui/InCallActivity.java b/java/com/android/incallui/InCallActivity.java
index 178a404..b82b6c9 100644
--- a/java/com/android/incallui/InCallActivity.java
+++ b/java/com/android/incallui/InCallActivity.java
@@ -200,9 +200,9 @@
   protected void onStop() {
     Trace.beginSection("InCallActivity.onStop");
     LogUtil.i("InCallActivity.onStop", "");
+    isVisible = false;
     super.onStop();
     common.onStop();
-    isVisible = false;
     Trace.endSection();
   }