DEV: Change the SXU HiK from 5.7 to 20

[ghalym]

Description

Change the SXU HiK from 5.7 to 20 for the new HE undulators.
https://jira.slac.stanford.edu/browse/ECS-9902

Motivation and Context

The HE undulators operating range for dual energy NC, have higher K ranges.

How Has This Been Tested?

Where Has This Been Documented?

Pre-merge checklist

• Libraries are set to Always Newest version (Library, *)
• Code works interactively
• Code contains descriptive comments
• Test suite passes locally
• Committed with pre-commit or ran pre-commit run --all-files
• Check that BP_IO parameters weren't modified unintentionally

[ZLLentz]

To elaborate more: this will enable some accelerator modes to be accepted without faulting or creating unsafe states.

There may still be another discussion later about removing the hi-k or about increasing it on the HXR side too, but for now this is exactly what we need.