Slightly better workaround for autoForm.created

A less ugly workaround for https://github.com/aldeed/meteor-autoform/issues/353,
using Blaze.getView instead of trawling through the template hierarchy
looking for the autoForm template.

Still needs to be called from a child of a rendered AutoForm template,
in order to be in some scope where the returned autoForm view is
associated with a rendered template.