Fix Dropzone following go-gitea#15315

go-gitea#15315 appears to have caused a change in the way Dropzone is imported - and it
now produces a module rather than the constructor.

This PR rather hackily just adds another Dropzone call to the result.

Signed-off-by: Andrew Thornton <art27@cantab.net>

Author: zeripath

web_src/js/features/dropzone.js

@@ -4,6 +4,6 @@ export default async function createDropzone(el, opts) {
     import(/* webpackChunkName: "dropzone" */'dropzone/dist/dropzone.css'),
   ]);
 
-  Dropzone.autoDiscover = false;
-  return new Dropzone(el, opts);
+  Dropzone.Dropzone.autoDiscover = false;
+  return new Dropzone.Dropzone(el, opts);
 }