fix(templates): remove orphan </div> in google_drive.html causing HTML accessibility lint failure

The extra </div> at line 260 (before the {% endif %} closing the admin
auth-method block) was introduced when the per-user OAuth wizard PR
restructured the admin section. Removing it balances the div tree so
that the outer container div is properly closed by line 427.

djlint frontend/templates/ --lint now reports 0 errors across 58 files.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

frontend/templates/google_drive.html

@@ -257,7 +257,6 @@
     </div>
   </div>
 
-  </div>
   {% endif %}{# end if not user_mode for admin auth-method block #}
 
   <!-- ── User-mode OAuth wizard ────────────────────────────────────────── -->