Fix issue where message contained % but wasn't intended for use with parameters

Summary: This fixes an issue with the C# linter where a message could be returned from cslint that wasn't intended for use with parameters. This just ensures there's enough parameters so that it won't crash (and consequently ignore lint messages).

Test Plan: Ran the linter, it didn't crash.

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9116