Fixes incorrect BB tracks being shown in the BB Editor (#6079)

[sdasda7777]

Fixes issue 6079, that is incorrect BB tracks being shown in the BB Editor.
The fix achieves this by not using getBar for calculating the number of the track (as that doesn't work with different signatures than n/n), and instead gets track number by dividing by DefaultTicksPerBar.

[LmmsBot]

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Linux

• Linux (AppImage): lmms-1.3.0-alpha.1.121%2Bg717e5ef-linux-x86_64.AppImage (build link)

Windows

• Windows 32-bit: lmms-1.3.0-alpha.1.121%2Bg717e5efbd-mingw-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha.1.121%2Bg717e5efbd-mingw-win64.exe (build link)
• Windows 32-bit: lmms-1.3.0-alpha-msvc2017-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha-msvc2017-win64.exe (build link)

macOS

• macOS : lmms-1.3.0-alpha.1.121%2Bg717e5efbd-mac10.14.dmg (build link)

🤖

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[sdasda7777]

#6096 is in the same file, so please do not pull this one.

[Veratil]

Why didn't you just add the commit to this PR?

[sdasda7777]

To be perfectly honest, I'm bit of a noob and didn't know that was a thing.

[Veratil]

To be perfectly honest, I'm bit of a noob and didn't know that was a thing.

All good! Next time you know you can just add to the same branch and push and it updates automagically here. :)

[sdasda7777]

I see, thanks