SDL_Log: restore SDL2's SDL_LogCategory order

src/SDL_log.c

@@ -91,9 +91,9 @@ static const char * const SDL_category_names[] = {
     "AUDIO",
     "VIDEO",
     "RENDER",
-    "GPU",
     "INPUT",
-    "TEST"
+    "TEST",
+    "GPU"
 };
 SDL_COMPILE_TIME_ASSERT(category_names, SDL_arraysize(SDL_category_names) == SDL_LOG_CATEGORY_RESERVED1);