ui: parser: add helper for lists of property strings

namely the filtering while preserving the original string,
it's just one line, but having a shorthand for it still makes it a bit
nicer

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

www/manager6/Parser.js

@@ -604,5 +604,9 @@ Ext.define('PVE.Parser', {
 	});
 	return [res, extradata];
     },
+
+    filterPropertyStringList: function(list, filterFn, defaultKey) {
+	return list.filter((entry) => filterFn(PVE.Parser.parsePropertyString(entry, defaultKey)));
+    },
 },
 });