Toolbar/Menubar focus keyboard shortcuts are shifting focus when a fullscreen modal/dialog is opened

[lkszzajac]

📝 Provide detailed reproduction steps (if any)

1. Open Feature-rich demo (https://ckeditor.com/ckeditor-5/demo/feature-rich/)
2. Launch a dialog/modal with dark background (no interaction with editor), for example Media Embed
3. Use Alt+F9 or Alt+F10 shortcuts to focus menubar/toolbar

✔️ Expected result

• menubar/toolbar is not focused, keyboard shortcut does not do anything
  OR
• dialog is closed, menubar/toolbar is focused as usual

❌ Actual result

• menubar/toolbar is focused, dialog is still opened, there is no way to return focus to the dialog

📃 Other details

• Browser: Chrome
• OS: macOS
• First affected CKEditor version: found in 43.1.0
• Installed CKEditor plugins: n/a

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