Android: fixed immediate transition to pause and resume.

"Pause" transition will add events:
 SDL_WINDOWEVENT_ENTER
 SDL_WINDOWEVENT_FOCUS_LOST
 SDL_WINDOWEVENT_MINIMIZED
 SDL_APP_WILL ENTER BACKGROUND
 SDL_APP_DID ENTER BACKGROUND

"Resume" transition will add events:
 SDL_APP_WILL ENTER FOREGROUND
 SDL_APP_DID ENTER FOREGROUND
 SDL_WINDOWEVENT_FOCUS_GAINED
 SDL_WINDOWEVENT_RESTORED

If Android application doesn't empty the event loop in between, it enters in
"paused" state when SDL_WINDOWEVENT_RESTORED is fetched.

See bug 3250 for pratical case.

src/video/android/SDL_androidevents.c

@@ -104,8 +104,8 @@ Android_PumpEvents(_THIS)
     } else {
         if (isPausing || SDL_SemTryWait(Android_PauseSem) == 0) {
             /* We've been signaled to pause, but before we block ourselves,
-            we need to make sure that certain key events have reached the app */
-            if (SDL_HasEvent(SDL_WINDOWEVENT) || SDL_HasEvent(SDL_APP_WILLENTERBACKGROUND) || SDL_HasEvent(SDL_APP_DIDENTERBACKGROUND) ) {
+            we need to make sure that the very last event have reached the app */
+            if (SDL_HasEvent(SDL_APP_DIDENTERBACKGROUND)) {
                 isPausing = 1;
             }
             else {