Hide archived repos by default in repo-list (#11440)

As discussed in #11268 hide archived repos by default in the
dashboard repo-list

Signed-off-by: Andrew Thornton <art27@cantab.net>

web_src/js/index.js

 
       let archivedFilter = params.get('repo-search-archived');
       if (!archivedFilter) {
-        archivedFilter = 'both';
+        archivedFilter = 'unarchived';
       }
 
       let searchQuery = params.get('repo-search-query');
             $('#archivedFilterCheckbox').checkbox('set indeterminate');
             break;
           default:
-            this.archivedFilter = 'both';
-            $('#archivedFilterCheckbox').checkbox('set indeterminate');
+            this.archivedFilter = 'unarchived';
+            $('#archivedFilterCheckbox').checkbox('set unchecked');
             break;
         }
         switch (this.privateFilter) {
           params.set('repo-search-private', this.privateFilter);
         }
 
-        if (this.archivedFilter === 'both') {
+        if (this.archivedFilter === 'unarchived') {
           params.delete('repo-search-archived');
         } else {
           params.set('repo-search-archived', this.archivedFilter);
             this.archivedFilter = 'both';
             break;
           default:
-            this.archivedFilter = 'both';
+            this.archivedFilter = 'unarchived';
             break;
         }
         this.page = 1;
           case 'archived':
             return repo.archived;
           default:
-            return true;
+            return !repo.archived;
         }
       },