Tooltips stop showing after the first editor is destroyed

[Dumluregn]

📝 Provide detailed reproduction steps (if any)

1. Open the all-types manual test (http://localhost:8125/ckeditor5/tests/manual/all-types.html).
2. Destroy the first editor (editors['#editor-classic'].destroy()).
3. Hover over the button in another editor.

✔️ Expected result

Tooltip is visible.

❌ Actual result

Tooltips don't show up.

📃 Other details

This issue was initially found in GH Writer (ckeditor/github-writer#375).

For details see ckeditor/github-writer#375 (comment).

• Browser: all
• OS: all
• First affected CKEditor version: 35.1.0
• Installed CKEditor plugins: UI

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