Stop removeFile once the file has been found (#357)

Co-authored-by: ilessiivi <iless@me.com>

Author: ilessiivi

src/Flow.js

@@ -686,6 +686,10 @@ export default class Flow extends Eventizer {
         this.files.splice(i, 1);
         file.abort();
         this.emit('file-removed', file);
+
+        if (!this.opts.allowDuplicateUploads) {
+          break;
+        }
       }
     }
   }