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.

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
@@ -105,6 +106,9 @@ static int WIIU_ForegroundAcquired(_THIS)
 	if (videodata->handleProcUI) {
 		SDL_SendAppEvent(SDL_APP_WILLENTERFOREGROUND);
 		SDL_SendAppEvent(SDL_APP_DIDENTERFOREGROUND);
+		if (GX2GetSwapInterval() == 0) {
+			GX2SetSwapInterval(0); /* If V-Sync is disabled, to let render not freeze, call this method with 0 */
+		}
 	}
 
 	while (window) {