Draw Ambitus with Flat Caps instead of Round Caps

[cbjeukendrup]

Draw Ambitus with Flat Caps instead of Round Caps, to match normal ledger lines and stems.

This is of course needed for the master branch too. Should I make a separate PR for that or can it be cherry-picked?

• 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

[cbjeukendrup]

The test failure is as expected. Should I do anything to update the tests?

[ecstrema]

the vtest compare against master, so you shouldn`t have to do anything.

[cbjeukendrup]

Interesting that the vtests still fail despite the label. Apparently the condition here is not working for some reason...