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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• Each commit's message describes its purpose and effects, and references the issue it resolves
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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:

[cbjeukendrup]

Let's go for a compromise: I added the author of the other PR as a "co-author", to provide some attribution. I prefer this solution though, because it is slightly more concise.

[rpatters1]

As long as we are sending reminders, what is the status of this one?