Remove institution sorting from admin user search page (bug #799617)

This change just removes the link allowing you to sort by institution
on admin user search when usersallowedmultipleinstitutions is turned
on.

Change-Id: I975d469ca3ca724ce4fd57e0bf0c427ec4ee361d
Signed-off-by: Richard Mansfield <richard.mansfield@catalyst.net.nz>

htdocs/lib/searchlib.php

@@ -301,6 +301,7 @@ function build_admin_user_search_results($search, $offset, $limit, $sortby, $sor
         }
         $cols['institution'] = array(
             'name'     => get_string('institution'),
+            'nosort'   => get_config('usersallowedmultipleinstitutions'),
             'template' => $template,
         );
     }

htdocs/theme/raw/templates/searchresulttable.tpl

@@ -14,6 +14,8 @@
           {foreach from=$cols key=f item=c}
           {if !$c.name}
             <th></th>
+          {elseif $c.nosort}
+            <th>{$c.name}</th>
           {else}
             <th class="search-results-sort-column{if $f == $sortby} {$sortdir}{/if}">
               <a href="{$searchurl}&sortby={$f}&sortdir={if $f == $sortby && $sortdir == 'asc'}desc{else}asc{/if}">{$c.name}</a>