ui: prune jobs: avoid duplicate params through nested input panels

input panel collect all form fields below them, so nesting two
input panels needs a bit of special care to avoid that each of the
panels adds the data of the deeper nested ones, resulting in
duplicate parameters that the backend then chokes one.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

www/window/PruneJobEdit.js

@@ -123,6 +123,7 @@ Ext.define('PBS.window.PruneJobEdit', {
 	columnB: [
 	    {
 		xtype: 'pbsPruneInputPanel',
+		getValues: () => ({}), // let that handle our inputpanel here
 	    },
 	    {
 		fieldLabel: gettext('Comment'),