SDL_sensor.h, SDL_video.h: remove comma at end of enumerator lists.

Avoids gcc -pedantic warnings, closes bug #4253.

include/SDL_sensor.h

@@ -71,7 +71,7 @@ typedef enum
     SDL_SENSOR_INVALID = -1,    /**< Returned for an invalid sensor */
     SDL_SENSOR_UNKNOWN,         /**< Unknown sensor type */
     SDL_SENSOR_ACCEL,           /**< Accelerometer */
-    SDL_SENSOR_GYRO,            /**< Gyroscope */
+    SDL_SENSOR_GYRO             /**< Gyroscope */
 } SDL_SensorType;
 
 /**