Add direct front name for API access from backend

If a store has the configuration "Add Store Code to Urls" set to yes, the access for the new relic module cannot be http://www.mydomain.com/newrelic/api/accountDetails/ but should be http://www.mydomain.com/{storecode}/newrelic/api/accountDetails/ with the "Add Store Code to Urls" configuration. 
With the fix provided, we keep the url without store code in the url and it stays accessible from the backend