Modify AlignAndFocusPowderFromFiles to take advantage of new capability in LoadEventNexus and AlignAndFocusPowder

[rosswhitfield]

Description of work

Summary of work

Fixes 5184: Modify AlignAndFocusPowderFromFiles to take advantage of new capability in LoadEventNexus and AlignAndFocusPowder

Further detail of work

To test:

Have a look at the system test added, when you run it you can see that the correct values are passed down to AlignAndFocusPowder

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Reviewer

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[jmborr]

👌