fix filter widget value casting for SmallIntegerField type.

resources/frontend_client/app/query_builder/filter_widget.react.js

@@ -145,6 +145,7 @@ export default React.createClass({
         if (value && value.length > 0) {
             // value casting.  we need the value in the filter to be of the proper type
             if (this.state.fieldDef.base_type === "IntegerField" ||
+                    this.state.fieldDef.base_type === "SmallIntegerField" ||
                     this.state.fieldDef.base_type === "BigIntegerField") {
                 value = parseInt(value);
             } else if (this.state.fieldDef.base_type === "BooleanField") {