Improved error text of WaitForJS method

Author: eriksape

src/Codeception/Module/WebDriver.php

@@ -2562,7 +2562,7 @@ public function waitForJS($script, $timeout = 5)
             return $wd->executeScript($script);
         };
         $message = sprintf(
-            'Waited for %d secs but script %s still not executed',
+            'Waited for %d secs but script %s still doesn\'t evaluate to true',
             $timeout,
             Locator::humanReadableString($script)
         );