Fix #287598: Do not remove spanners from the measures outside of the rewrite range.

[WcRnm]

Resolves: https://musescore.org/en/node/287598

Spanners in the measure following a range of measures were deleted during a rewrite.

• 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

[igorkorsukov]

@WcRnm Could you please port the changes to the master

[WcRnm]

@igorkorsukov Yes, I should be able to get to the port to master later this week.