fix. typo

ios/RCTAgora/RCTAgora.m

                                                  @"uid": @(uid),
                                                  @"width": @(size.width),
                                                  @"height": @(size.height),
-                                                 @"roration": @(rotation)
+                                                 @"rotation": @(rotation)
                                                  }];
 }