fix remarketing code

src/views/tpl/widget/inc/d3ga_universal_remarketing.tpl

@@ -10,20 +10,21 @@
         ---------------------------------------------------*}]
 
         <script type="text/javascript">
-            let google_tag_params = {
+            var google_tag_params = {
                 ecomm_prodid: [{$sD3GARemarketingProdId}],
                 ecomm_pagetype: '[{$sD3GARemarketingPageType}]',
                 ecomm_totalvalue: [{$sD3GARemarketingPrice}]
             };
         </script>
         <script type="text/javascript">
+            [{*** don't change to "let ..." because of required global scope ***}]
             /* <![CDATA[ */
-            let google_conversion_id = [{$oD3GASettings->getValue('sD3GARemarketingConversionId')}];
+            var google_conversion_id = [{$oD3GASettings->getValue('sD3GARemarketingConversionId')}];
             [{if $oD3GASettings->getValue('sD3GARemarketingConversionLabel')}]
                 var google_conversion_label = "[{$oD3GASettings->getValue('sD3GARemarketingConversionLabel')}]";
             [{/if}]
-            let google_custom_params = window.google_tag_params;
+            var google_custom_params = window.google_tag_params;
-            let google_remarketing_only = true;
+            var google_remarketing_only = true;
             /* ]]> */
         </script>
         <script type="text/javascript" src="//www.googleadservices.com/pagead/conversion.js">