Fixed CSRF security vulnerability issue. per Alvin Lindstam. Fixes #4217

Initial patch by: Khushboo Vashi
Modified by: Ashesh Vashi and Murtuza Zabuawala

web/pgadmin/misc/sql/static/js/sql.js

@@ -123,7 +123,10 @@ define('misc.sql', [
               $.ajax({
                 url: url,
                 type: 'GET',
-                beforeSend: function() {
+                beforeSend: function(xhr) {
+                  xhr.setRequestHeader(
+                    pgAdmin.csrf_token_header, pgAdmin.csrf_token
+                  );
                   // Generate a timer for the request
                   timer = setTimeout(function() {
                     // Notify user if request is taking longer than 1 second