LP1813088: Coerce Values to String in egGridValueFilter
Coerce values to string in the switch for Boolean columns in the main
egGridValueFilter function. This came about after an IRC conversation
with Mike Rylander who suggested this as a possible fix. It should
when field values are strings, integers, or Booleans.
Signed-off-by: Jason Stephenson <jason@sigio.com> Signed-off-by: Chris Sharp <csharp@georgialibraries.org>