Rename property 'workaround' for dashboard shortcuts

The dashboard shortcut configurations below /hippo:configuration/hippo:frontend/cms/cms-dashshortcuts have a Long property called 'workaround'.

It is used for ordering by means of the following query:
/hippo:configuration/hippo:frontend/cms/cms-dashboard/shortcutsPlugin/shortcuts.query=/jcr:root/hippo:configuration/hippo:frontend/cms/cms-dashshortcuts/*/@workaround order by @workaround

Let's rename it.

Needs changing in dashboard shortcut wizard too.