Refactor filter specs
Refactor filter specs

This is more DRY but it also contains less confusing method calls that
kind of look as hashes.

vraravam/activeadmin,deivid-rodriguez/activeadmin,deivid-rodriguez/activeadmin,javierjulio/activeadmin,deivid-rodriguez/activeadmin,mrjman/activeadmin,activeadmin/activeadmin,activeadmin/activeadmin,activeadmin/activeadmin,mrjman/activeadmin,javierjulio/activeadmin,mrjman/activeadmin,vraravam/activeadmin,vraravam/activeadmin,javierjulio/activeadmin