Galil: Redefines positions if sent move on IOC start up

As an instrument scientist I would like an IOC start up to not affect motion in any way. On LARMOR it was seen that when a move was sent to the IOC on start up due to https://github.com/ISISComputingGroup/IBEX/issues/6423 the IOC redefined the position on the motor to somewhere it was not (~10:15 in the attached log and graph). This was likely a combination of the Galil always redefining positions on start up (normally not an issue as it defines to it's current position) and the move being sent at just the wrong time.

[GALIL_05-20210421.log](https://github.com/ISISComputingGroup/IBEX/files/6357659/GALIL_05-20210421.log)


## Acceptance Criteria
* The IOC does not redefine to the wrong position on start up. If we can't fix the race condition then just remove the redefining of position at all
* There is a test for this

Beginne mit der angehängten GALIL_05-20210421.log und der in Issue 6423 beschriebenen Startbewegung und konzentriere dich auf den Zeitpunkt um 10:15. Reproduziere das IOC-Startszenario und überprüfe, dass die Motorposition nicht fälschlicherweise neu definiert wird; füge einen Test hinzu, der diesen Startfall abdeckt.

Vom Indexierungsmodell aus dem Issue-Text verfasst.