[MU4 Issue] "View | Fullscreen" does not appear as a toggle

[iwoithe]

Describe the bug The View | Fullscreen menu item does not look like a toggle even though it acts as one.

To Reproduce Steps to reproduce the behavior:

1. Open MuseScore 4
2. Click View | Fullscreen
3. Open View again
4. A tick does not appear

https://user-images.githubusercontent.com/73422868/209420946-7a3b486f-68fa-41b4-b3e7-8bd69356da0b.mp4

Expected behavior

A tick to appear next to Fullscreen, like all of the togglable panels in the View menu.

Platform information

• Linux (Slackware 15, Xfce 4.16)

Additional context

• Build commit: d759f2983173fe513111d4d6ab2ce65334fd1c20