ogc: set fullscreen height to EFB's height

Since rendering happens on the EFB, we should report it's height as the
fullscreen display's height. Failing to do so results in missing part of
the picture and/or in invalid memory accesses.

src/video/ogc/SDL_ogcvideo.c

@@ -153,7 +153,7 @@ int OGC_VideoInit(_THIS)
     SDL_zero(mode);
     mode.format = SDL_PIXELFORMAT_ARGB8888;
     mode.w = vmode->fbWidth;
-    mode.h = vmode->xfbHeight;
+    mode.h = vmode->efbHeight;
     mode.refresh_rate = 60;
     mode.driverdata = NULL;
     if (SDL_AddBasicVideoDisplay(&mode) < 0) {