Fix avatar radius problem on the new issue page (go-gitea#31506) (go-gitea#31508)

Backport go-gitea#31506 by charles7668

Co-authored-by: charles <[email protected]>

Author: GiteaBot

web_src/css/repo.css

@@ -535,7 +535,7 @@ td .commit-summary {
   min-width: 100px;
 }
 
-#new-issue .avatar {
+#new-issue .comment .avatar {
   width: 3em;
 }