This unifies the HTML structure of the query form on the calendars/show
and gantts/show views to be the same as it is currently for the issues
and spent time views, which were themself unified into the new
queries/_query_form partial in r15649.
Patch by Mischa The Evil.
git-svn-id: http://svn.redmine.org/redmine/trunk@16701 e93f8b46-1217-0410-a6f0-8f06a7374b81