Typo prevents FIQL query values from being URI-encoded

@@ -123,7 +123,7 @@ function fromFiql(fiql) {
  * @returns String with reserved characters URL-encoded
  */
 function escapeSearchValue(value) {
-       if (typeof value === 'String') {
+       if (typeof value === 'string') {
                return value
                        .replace('!', '%21')
                        .replace('$', '%24')