fix: #299697: Repeat play a bar, goes back to first bar briefly

[jrpear]

Resolves: https://musescore.org/en/node/299697

Made cursor rewind earlier in loop play mode and changed rewind target from 0 to loopIn.

• I signed CLA
• I made sure the code in the PR follows the coding rules
• I made sure the code compiles on my machine
• I made sure there are no unnecessary changes in the code
• I made sure the title of the PR reflects the core meaning of the issue you are solving
• I made sure the commit message(s) contain a description and answer the question "Why do those changes fix that particular issue?" or "Why are those changes really necessary as improvements?"
• I made sure the commit message title starts with "fix #424242:" if there is a related issue
• I created the test (mtest, vtest, script test) to verify the changes I made

[Jojo-Schmitz]

Under which name did you sign the CLA?
I don't see any tests in this PR. Not sure any are needed, but you ticked that box.

[jrpear]

I signed under jpear1. I didn't change any tests in this PR. I thought that checkbox was for verifying that I had run the existing tests on my changes. I set up my own copy of MuseScore on Travis and the tests passed on there.

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[ProbablyFaiz]

Looks good to me, fixed the bug on my machine

[anatoly-os]

@jpear1 why do you make a PR from your account but use another person's branch (https://github.com/CCS-1L-F19)?

[jrpear]

I was working on MuseScore as part of a class project and the professor asked that all of our repos be in the class organization so that he could easily track everyone's progress. I can submit another PR from my account there's worries about the CLA agreement.

[Jojo-Schmitz]

Yes, better resubmit or rebase to come from your account

[jrpear]

Done.