hard code SL GAP low limit

[patoppermann]

Description

Hard code the Exit Slit lower limit to true.

Motivation and Context

The limit switch is not installed in the right place, so we will remove it from the code or set it to always True via hard core.

How Has This Been Tested?

input via online change

Where Has This Been Documented?

Screenshots (if appropriate):

Pre-merge checklist

• Code works interactively
• Code contains descriptive comments
• Test suite passes locally
• Libraries are set to fixed versions and not Always Newest
• Code committed with pre-commit (alternatively pre-commit run --all-files)

[NSLentz]

looks good to me. Later on, we can try to convince Georgie to bring this back with the open loop approach or perhaps even better we can get the switch repositioned.