Fix #14678: Tempo set in New Score other than quarter note doesn't reflect supposed BPM

[CoolSpy3]

Resolves: #14678

Resolves a bug where new scores would not have the correct tempo marking when a non-quarter-note tempo was specified. This is accomplished by correcting the implementation of the MasterNotation::applyOptions method. When setting the tempo of the score, we use the tempo's duration option to scale the bpm value so that it is in units of "Quarter Notes / Second" rather than "Duration / Second".

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• I created a unit test or vtest to verify the changes I made (if applicable)

I don't know enough about this repository to write unit tests for this change. If maintainers feel that these changes necessitate unit tests, please point me in the direction of some similar samples and/or documentation, and I'll see what I can do.

[Jojo-Schmitz]

See also #24840 now

[rpatters1]

I worked on it because it was unassigned. Take your pick and close the other one.