Allow all strings for file_copier_provider
Allow all strings for file_copier_provider

The existing regex is too restrictive.
Plugins allow other values.  eg I want to use
'com.batix.rundeck.plugins.AnsibleFileCopier'

cernops/puppet-rundeck,tkwilliams/puppet-rundeck,cernops/puppet-rundeck,voxpupuli/puppet-rundeck,cy4n/puppet-rundeck,voxpupuli/puppet-rundeck,bodhi-space/puppet-rundeck,tkwilliams/puppet-rundeck,puppet-community/puppet-rundeck,bodhi-space/puppet-rundeck,puppet-community/puppet-rundeck,dalisch/puppet-rundeck,dalisch/puppet-rundeck,cy4n/puppet-rundeck