change test 15.3.5.4_2-89 to call bound function before returning for Bugzilla issue 1533

test/suite/ch15/15.3/15.3.5/15.3.5.4/15.3.5.4_2-89gs.js

@@ -11,7 +11,7 @@
 
 
 function f() { return gNonStrict();};
-(function () {"use strict"; return f.bind();})();
+(function () {"use strict"; return f.bind()();})();
 
 
 function gNonStrict() {