Fix Ghost Notes aren't displayed properly after loading a project

[cyber-bridge]

Fixes #5912

[IanCaio]

LGTM!

[LmmsBot]

🤖 Hey, I'm @LmmsBot from github.com/lmms/bot and I made downloads for this pull request, click me to make them magically appear! 🎩

Windows

• Windows 32-bit: lmms-1.3.0-alpha.1.69%2Bg6d8c2728c-mingw-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha.1.69%2Bg6d8c2728c-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)

Linux

• Linux (AppImage): lmms-1.3.0-alpha.1.69%2Bg6d8c272-linux-x86_64.AppImage (build link)

macOS

• macOS : lmms-1.3.0-alpha.1.69%2Bg6d8c2728c-mac10.14.dmg (build link)

🤖

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[akimaze]

Hi, @IanCaio that PR is just one line and have 2 approvals. Maybe should be merged?