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