Fix: HBAC Test tab is missing

Caused by typo in metadata provider source path.

No metadata -> no HBAC test entity -> no tab

https://fedorahosted.org/freeipa/ticket/3627

install/ui/src/freeipa/_base/metadata_provider.js

@@ -32,7 +32,7 @@ define(['dojo/_base/lang', './Provider', './Search_provider'],
     var commmads = new Provider({
         code: '@mc:',
         source: metadata,
-        path: 'commmads'
+        path: 'commands'
     });
     var object_param = new Search_provider({
         code: '@mo-param:',