MDL-38763 fix trailing whitespace

lib/templates/permissionmanager_panelcontent.mustache

@@ -30,7 +30,7 @@
     * roles array of role details
 
     Example context (json):
-    { "message": "Do you really want to remove Non-editing teacher from the list of allowed roles for capability 
+    { "message": "Do you really want to remove Non-editing teacher from the list of allowed roles for capability
                 View added and updated modules in recent activity block?",
       "roles": [{"roleid": 1, "rolename": "manager", "disabled":"disabled"}]}
 }}
@@ -41,4 +41,4 @@
             <input type="button" value="{{rolename}}" data-role-id="{{roleid}}" {{disabled}}/>
         {{/roles}}
     </div>
-</div>
+</div>