dashboard: fix opensearch xml

leading whitespace is not wellformed
now tested and works in firefox, chrome is buggy

circle/dashboard/templates/dashboard/vm-opensearch.xml

-{% load i18n %}
-<?xml version="1.0" encoding="UTF-8"?>
+{% load i18n %}<?xml version="1.0" encoding="UTF-8"?>
 <OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
   <ShortName>{% blocktrans with name=COMPANY_NAME %}{{name}} virtual machines{% endblocktrans %}</ShortName>
   <Url type="text/html"