unable to edit a totem element as a user without admin permission

Message from Caleb on this PR : https://github.com/xwiki-contrib/totem-application/pull/4

Not entirely sure where this should be reported but I'll put it here so we don't lose it.
I am unable to edit a totem element as a user without admin permission, this is tested on xwiki labs.
In the console I see: https://labs.xwiki.com/xwiki/bin/edit/XWiki/SuggestDisplayEditItems?editor=inline&xpage=plain&action=newItem&className=TotemCode.TotemBlockClass&propertyName=source&parent=xwiki:TotemCode.EditContent&space=Totem Failed to load resource: the server responded with a status of 403 (Forbidden)