Add predicate search box for ACLs in Ratel

Moved from GitHub ratel/130

Posted by danielmai:

For editing ACLs with a decent number of predicates, it’d be great to be able to search for the predicates instead of having to scroll down the list to edit permissions.

Related to #34 which is about general filtering for predicates in the schema list.

Aelbannan commented :

Added in bfc50b3