Don't auto-init SimpleMDE for review textarea (#9574)

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: Lauris BH <lauris@nix.lv>

templates/repo/diff/box.tmpl

 											<a class="preview item" data-url="{{$.Repository.APIURL}}/markdown" data-context="{{$.RepoLink}}">{{$.i18n.Tr "preview"}}</a>
 									</div>
 									<div class="ui bottom attached active write tab segment">
-											<textarea tabindex="1" name="content"></textarea>
+											<textarea class="review-textarea" tabindex="1" name="content"></textarea>
 									</div>
 									<div class="ui bottom attached tab preview segment markdown">
 									{{$.i18n.Tr "loading"}}

web_src/js/index.js

     return;
   }
 
-  setCommentSimpleMDE($('.comment.form textarea'));
+  setCommentSimpleMDE($('.comment.form textarea:not(.review-textarea)'));
   initBranchSelector();
   initCommentPreviewTab($('.comment.form'));
   initImagePaste($('.comment.form textarea'));