Fix #25138: Notes cannot be moved between staffs unless both staffs are of standard type.

Fix for bug #25138, where notes in standard notation staff could be moved to staffs of a different type, causing segmentation faults when loading a file where this has taken place and been saved. We don't set the _layoutAll flag in moveDown() any longer as no effect was found during testing, so moveDown() and moveUp() are now very similar as should be the case anyway.

I'm out of the country for some of the next week, but I may be able to respond to any queries on this pull request here.