Fix avatar image location

Author: takezoe

src/main/twirl/gitbucket/gist/commentlist.scala.html

@@ -4,9 +4,9 @@
   repository: gitbucket.core.service.RepositoryService.RepositoryInfo)(implicit context: gitbucket.core.controller.Context)
 @import gitbucket.core.view.helpers
 @comments.map { comment =>
-  <div class="issue-avatar-image">@helpers.avatar(comment.commentedUserName, 48)</div>
   <div class="panel panel-default issue-comment-box" id="[email protected]">
     <div class="panel-heading">
+      @helpers.avatar(comment.commentedUserName, 20)
       @helpers.user(comment.commentedUserName, styleClass="username strong")
       <span class="muted">
         commented