include/SDL_video.h: Remove a comma at end of enumerator list

include/SDL_video.h

@@ -207,7 +207,7 @@ typedef enum
 {
     SDL_FLASH_CANCEL,                   /**< Cancel any window flash state */
     SDL_FLASH_BRIEFLY,                  /**< Flash the window briefly to get attention */
-    SDL_FLASH_UNTIL_FOCUSED,            /**< Flash the window until it gets focus */
+    SDL_FLASH_UNTIL_FOCUSED             /**< Flash the window until it gets focus */
 } SDL_FlashOperation;
 
 /**