Add missing (int) casts to Herald rule editing
Summary: Fixes T3792. These raise errors if the database is in strict mode and you try to create an "any" rule.
Test Plan: Created a rule with "any".
Reviewers: btrahan, chad
Reviewed By: chad
CC: aran
Maniphest Tasks: T3792
Differential Revision: https://secure.phabricator.com/D6883