fix cancelUpload not working due to incorrect if condition

Author: BaderSerhan

ios/VydiaRNFileUploader.m

@@ -226,7 +226,8 @@ - (void)copyAssetToFile: (NSString *)assetUrl completionHandler: (void(^)(NSStri
 RCT_EXPORT_METHOD(cancelUpload: (NSString *)cancelUploadId resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject) {
     [_urlSession getTasksWithCompletionHandler:^(NSArray *dataTasks, NSArray *uploadTasks, NSArray *downloadTasks) {
         for (NSURLSessionTask *uploadTask in uploadTasks) {
-            if (uploadTask.taskDescription == cancelUploadId) {
+            if ([uploadTask.taskDescription isEqualToString:cancelUploadId]){
+                // == checks if references are equal, while isEqualToString checks the string value
                 [uploadTask cancel];
             }
         }