Fix fake warnings when stopping the hexapod

yuki.moritani reports :

2025-04-24 19:33:50.877Z cmds 20 Actor.py:524 new cmd: slit STOP 2025-04-24 19:33:50.879Z cmds 20 CommandLink.py:122 > 0 0 d 1745523230.8789644 thread has started .run() 2025-04-24 19:33:50.880Z cmds 20 CommandLink.py:122 > 0 0 i slitFSM=ONLINE,SHUTDOWN 2025-04-24 19:33:50.881Z cmds 20 CommandLink.py:122 > 0 0 i metaFSM=ONLINE,SHUTDOWN 2025-04-24 19:33:50.883Z cmds 20 CommandLink.py:122 > 2 9 i text="detaching slit..." 2025-04-24 19:33:50.883Z actor 20 ICC.py:99 stopping existing slit controller 2025-04-24 19:33:50.883Z cmds 20 CommandLink.py:122 > 2 9 i text="aborting motion..." 2025-04-24 19:33:50.891Z cmds 20 CommandLink.py:122 > 2 9 w text="command failed: RuntimeError('GroupMoveAbort : Error -22 : Not allowed action') in errorChecker() at /software/mhs/products/Linux64/ics_enuActor/1.5.21/python/enuActor/Controllers/slit.py:651"

it's been a long lasting bug, fix it.