Assign to me and Created by me are not shown when current user is…

… anonymous.

Cause:
Although current user is anonymous, `Assign to me` and `Create by me` are shown on `Issue` menu. But it is nonsense. Anonymous can not write any issues and not be a assignee.

Solutions:
When current user is anonymous, `Assign to me` and `Create by me` will not be shown.
For these modifications, actually, `!UserApp.currentUser().isSiteManager` is replaced to `!UserApp.currentUser().isAnonymous`. The previous codes are bug and new codes are to solve this issue.

Private-issue: 1676

app/views/issue/partial_list_quicksearch.scala.html

@@ -34,7 +34,7 @@
             <span class="num-badge pull-right">@Issue.countIssuesBy(project.id, paramForEveryone)</span>
         </a>
     </li>
-    @if(!UserApp.currentUser().isSiteManager){
+    @if(!UserApp.currentUser().isAnonymous){
     <li @if(param.assigneeId == UserApp.currentUser().id){ class="active"}>
         <a pjax-filter href="#"
            data-assignee-id="@User.findByLoginId(session.get("loginId")).id"