Playground - Clear Format button fix

[ManuelOjedaWz]

This PR fixes an issue found in the Playground. When you select a portion of a selected text with the format applied, it could wrongly remove the format to another portion of the sentence with the same format applied.

Reference:

Screen.Recording.2024-04-08.at.11.07.17.mov

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 8, 2024 9:06pm
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[ivailop7]

@ManuelOjedaWz Could you sign the CLA, rest looks good.

[ManuelOjedaWz]

@ivailop7 I've already signed the CLA but is not being detected here

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[i-tengfei]

These changes seem to have caused another bug, and it is now impossible to clear the formatting of multi-line text.

[ivailop7]

Can you raise an issue, to have a look.