Pre-empt "required" classifying #4639

Removing the required nature of the questions
in the "Edit Provider" page. These questions are
drawn from shared partials that have the 
required classification added by default using
html_attrs. This change passes in an empty hash
for html_attrs that will prevent the required 
classification.
Merge pull request #296 from NUBIC/task_4639_pbs_sites_remove_required_fields_for_provider_information

Task 4639 pbs sites remove required fields for provider information