[@mantine/rte] Fix issue with ImageUploader index null error (#2529)

Co-authored-by: Nicholas Argyle <nick@ip-192-168-86-58.ec2.internal>

src/mantine-rte/src/modules/image-uploader/ImageUploader.ts

@@ -99,7 +99,7 @@ export class ImageUploader {
             setTimeout(() => {
               this.range = this.quill.getSelection();
               this.readAndUploadFile(file);
-            }, 0);
+            }, 1);
           }
         }
       }