Fix static content deployment issue

As mentioned in magento/magento2#18048
M2 team was not able to reproduce, however I was able to on another third party module.

Author: kamilszewczyk

view/frontend/templates/widget_script.phtml

@@ -1,4 +1,4 @@
 <script type="text/javascript">
-(function e(){var e=document.createElement("script");e.type="text/javascript",e.async=true,e.src="//staticw2.yotpo.com/<?php echo $this->_config->getAppKey(); ?>/widget.js ";var t=document.getElementsByTagName("script")[0];t.parentNode.insertBefore(e,t)})();
+(function e(){var e=document.createElement("script");e.type="text/javascript",e.async=true,e.src="//staticw2.yotpo.com/<?= $this->_config->getAppKey(); ?>/widget.js ";var t=document.getElementsByTagName("script")[0];t.parentNode.insertBefore(e,t)})();
 </script>