appview/pages: remove unnecessary blob gutter comment code for now

Signed-off-by: Lewis <[e-mail]>

appview/pages/templates/repo/blob.html

···
       </div>
     {{ end }}
     {{ template "fragments/multiline-select" }}
-    {{ template "fragments/line-quote-button" }}
     <script>
       (() => {
         const abortController = new AbortController();