Only show transfer action if the user is the owner

See merge request !546
3 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS-Master.UnitTest-Master

02:54:35

failed SlapOS.Eggs.UnitTest-Master.Python2

00:14:32

failed SlapOS.Eggs.UnitTest-Master.Python3

00:17:06