Small fixes to DiskChopper.from_nexus #782

Job	Run time
Formatting and static analysis	13s
Mantid tests	1m 30s
Tests (ubuntu-24.04, 3.11, py311) / package-test	27s
Tests (ubuntu-24.04, 3.11, py311) / test	2m 47s
docs / Build documentation	6m 9s
	11m 6s

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