slapos_jio: Render subform for an object rather them hidden value on restrict mode

The recursive call makes the tree be rendered as hidden inputs respecting all the values
7 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS.Eggs.UnitTest-Master.Python2

00:18:57

failed SlapOS.Eggs.UnitTest-Master.Python3

00:24:37

failed SlapOS.Eggs.UnitTest-Master.Python2

00:18:24

failed SlapOS.Eggs.UnitTest-Master.Python2

00:27:15

failed SlapOS.Eggs.UnitTest-Master.Python2

00:20:37

failed SlapOS.Eggs.UnitTest-Master.Python3

00:17:36

failed SlapOS.Eggs.UnitTest-Master.Python3

00:29:39