Wii U / Video: Fixed resume of video afrer the home menu close (#107)

* Wii U / Video: Fixed resume of video afrer the home menu close

This bug happens just when V-Sync is off and attempting to open and close the home menu. To fix the black/frozen screen it's just enough to call the `GX2SetSwapInterval(0);` right after entering the foreground back.

* Move out of handleProcUI cond and tweaked comment

Author: Wohlstand

src/video/wiiu/SDL_wiiuvideo.c

@@ -57,6 +57,7 @@
 #include <gx2/state.h>
 #include <gx2r/mem.h>
 #include <gx2r/surface.h>
+#include <gx2/swap.h>
 
 #define DRC_SCREEN_WIDTH    854
 #define DRC_SCREEN_HEIGHT   480
@@ -107,6 +108,10 @@ static int WIIU_ForegroundAcquired(_THIS)
 		SDL_SendAppEvent(SDL_APP_DIDENTERFOREGROUND);
 	}
 
+	if (GX2GetSwapInterval() == 0) {
+		GX2SetSwapInterval(0); /* Workaround for leaving foreground with a swap interval 0 */
+	}
+
 	while (window) {
 		SDL_Renderer* renderer = SDL_GetRenderer(window);