sim: make amagnet sim cfg startable again

Change-Id: I1e7b7dd6e4069c616f49edbe4e223f501a000398
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/34844
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Georg Brandl <g.brandl@fz-juelich.de>
Reviewed-by: Alexander Zaft <a.zaft@fz-juelich.de>

cfg/sim_mlz_amagnet_cfg.py

@@ -100,10 +100,10 @@ Mod('currentsource',
 Mod('mf',
     'frappy_mlz.amagnet.GarfieldMagnet',
     'magnetic field module, handling polarity switching and stuff',
-    subdev_currentsource='currentsource',
-    subdev_enable='enable',
-    subdev_polswitch='polarity',
-    subdev_symmetry='symmetry',
+    currentsource='currentsource',
+    enable='enable',
+    polswitch='polarity',
+    symmetry='symmetry',
     target = Param(unit='T'),
     value = Param(unit='T'),
     userlimits=(-0.35, 0.35),