fix: restore window.titleBarStyle and breadcrumbs.enabled

[kittaakos]

Motivation

This PR partially fixes #1733 by restoring the default Theia behavior of the window.titleBarStyle (on Windows and Linux) and breadcrumbs.enabled preferences.

Change description

• breadcrumbs.enabled should enable the breadcrumbs on all platforms. By default, it is disabled in IDE2.

• The window.titleBarStyle preference should be verified together with the window.menuBarVisibility values. The custom menu has special handling from Theia when the app is running in full-screen mode:

  

Other information

Ref: #1733

Reviewer checklist

• PR addresses a single concern.
• The PR has no duplicates (please search among the Pull Requests before creating one)
• PR title and description are properly filled.
• Docs have been added / updated (for bug fixes / features)

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