Set correct tempo for metronome marking #14678

[rpatters1]

Resolves: #14678

When creating a new document, the tempo was not changed to match the metronome marking. Instead, the tempo always was the tempo for quarter notes. (See #14678.) This change corrects that.

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[Jojo-Schmitz]

What about #21458 ?

[rpatters1]

I worked on it because it was unassigned. Merge one and close the other. It looks like either gets the job done.

[cbjeukendrup]

@rpatters1 For in the future: if there is already a PR for an issue, this is indicated on the issue page: