Vita: default window size for tests

include/SDL_test_common.h

@@ -37,6 +37,9 @@
 #if defined(__PSP__)
 #define DEFAULT_WINDOW_WIDTH  480
 #define DEFAULT_WINDOW_HEIGHT 272
+#elif defined(__VITA__)
+#define DEFAULT_WINDOW_WIDTH  960
+#define DEFAULT_WINDOW_HEIGHT 544
 #else
 #define DEFAULT_WINDOW_WIDTH  640
 #define DEFAULT_WINDOW_HEIGHT 480