docs: add Toolkit.js to prune simulator

from proxmox-widget-toolkit-dev and not as normal dependency,
else we would have to ship widget-toolkit on the wiki

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

docs/prune-simulator/prune-simulator_source.js

@@ -1,7 +1,5 @@
-// FIXME: HACK! Makes scrolling in number spinner work again. fixed in ExtJS >= 6.1
-if (Ext.isFirefox) {
-    Ext.$eventNameMap.DOMMouseScroll = 'DOMMouseScroll';
-}
+// for Toolkit.js
+function gettxt(val) { return val; };
 
 Ext.onReady(function() {
     const NOW = new Date();