Added missing reserved field in SDL_CameraDeviceEvent (thanks @Saalvage!)

include/SDL3/SDL_events.h

@@ -560,6 +560,7 @@ typedef struct SDL_AudioDeviceEvent
 typedef struct SDL_CameraDeviceEvent
 {
     SDL_EventType type; /**< ::SDL_EVENT_CAMERA_DEVICE_ADDED, ::SDL_EVENT_CAMERA_DEVICE_REMOVED, ::SDL_EVENT_CAMERA_DEVICE_APPROVED, ::SDL_EVENT_CAMERA_DEVICE_DENIED */
+    Uint32 reserved;
     Uint64 timestamp;   /**< In nanoseconds, populated using SDL_GetTicksNS() */
     SDL_CameraDeviceID which;       /**< SDL_CameraDeviceID for the device being added or removed or changing */
     Uint8 padding1;