axis: use task_plan_synch instead of unneeded change to MODE_MDI
axis: use task_plan_synch instead of unneeded change to MODE_MDI

This doesn't solve the problem of being unable to call
c.program_open in some circumstances, but it does get rid of some
black magic which is good.

Signed-off-by: Jeff Epler <623a871f32baaca066adfe0cac08d7aa7d34027d@unpythonic.net>

ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror