Sub Menus Don't Respect Application Style

[trin94]

Describe the bug
Sub menus do not inherit their parent's style on Windows.

Screenshots

Data

• OS: Windows
• Version and commit id: 0.9.0-beta1 - 6aafd0f

Additional context

• Bug is known upstream: QTBUG-139603

[trin94]

Added a workaround. Once it's fixed upstream, we can remove that workaround.

[trin94]

Bug is fixed upstream. Reopening this issue to remove the workaround once we switch to Qt 6.10.1.