do not show code when editing direct invitations

src/app/admin/directInvitations/DirectInvitations.svelte

@@ -97,7 +97,6 @@
   }}
   target={directInvitationEditPopupDirectInvitation}
   keys={[
-    [{ key: 'code', type: 'text', label: 'Code', options: { required: true, readonly: true, dynamicWidth: true } }],
     [{ key: 'uuid', type: 'text', label: 'UUID', options: { dynamicWidth: true } }],
     [{ key: 'comment', type: 'textarea', label: 'Kommentar', options: { dynamicWidth: true } }]
   ]}