[Android] Fix the game thread never leaving.

Source/Core/DolphinWX/Src/MainAndroid.cpp

@@ -200,6 +200,7 @@ JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_PauseEmulati
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_StopEmulation(JNIEnv *env, jobject obj) 
 {
 	PowerPC::Stop();
+	updateMainFrameEvent.Set(); // Kick the waiting event
 }
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_onTouchEvent(JNIEnv *env, jobject obj, jint Action, jfloat X, jfloat Y)
 {