Attachment, rename not needed anymore since Meteor-Files 2.3.0

Thanks to @dr-dimitru
https://github.com/wekan/wekan/pull/4638#issuecomment-1217883870

00ab6f723b

models/avatars.js

@@ -45,6 +45,10 @@ Avatars = new FilesCollection({
   debug: false, // Change to `true` for debugging
   collectionName: 'avatars',
   allowClientCode: true,
+  sanitize(str, max, replacement) {
+    // keep the original filename
+    return str;
+  },
   storagePath() {
     const ret = fileStoreStrategyFactory.storagePath;
     return ret;