fix: 400 error editing posts and comment

This is a backport from the master

src/discussions/comments/comment/CommentEditor.jsx

@@ -55,7 +55,9 @@ function CommentEditor({
 
   const initialValues = {
     comment: comment.rawBody,
-    editReasonCode: comment?.lastEdit?.reasonCode || (userIsStaff ? 'violates-guidelines' : ''),
+    editReasonCode: comment?.lastEdit?.reasonCode || (
+      userIsStaff && canDisplayEditReason ? 'violates-guidelines' : undefined
+    ),
   };
 
   const handleCloseEditor = (resetForm) => {

src/discussions/posts/post-editor/PostEditor.jsx

@@ -138,7 +138,9 @@ function PostEditor({
     follow: isEmpty(post?.following) ? true : post?.following,
     anonymous: allowAnonymous ? false : undefined,
     anonymousToPeers: allowAnonymousToPeers ? false : undefined,
-    editReasonCode: post?.lastEdit?.reasonCode || (userIsStaff ? 'violates-guidelines' : ''),
+    editReasonCode: post?.lastEdit?.reasonCode || (
+      userIsStaff && canDisplayEditReason ? 'violates-guidelines' : undefined
+    ),
     cohort: post?.cohort || 'default',
   };