Replace deprecated String.prototype.substr() with String.prototype.slice() (#18796)

String.prototype.substr() is deprecated (see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) so we replace it with the slice() method which works similarily but isn't deprecated.

Signed-off-by: Tobias Speicher <rootcommander@gmail.com>

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

web_src/js/features/common-global.js

@@ -211,7 +211,7 @@ export function initGlobalLinkActions() {
         };
         for (const [key, value] of Object.entries(dataArray)) {
           if (key && key.startsWith('data')) {
-            postData[key.substr(4)] = value;
+            postData[key.slice(4)] = value;
           }
           if (key === 'id') {
             postData['id'] = value;