Do not show chat header for the classic Duo

Julia Miocenerequested to merge
jmiocene/hide-chat-header-for-classic-duo into master

What does this MR do and why?

According to design there should be no header for the Duo Classic chat window.

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CleanShot_2025-11-04_at_15.05.13_2x CleanShot_2025-11-04_at_15.08.58_2x
CleanShot_2025-11-04_at_15.05.23_2x CleanShot_2025-11-04_at_15.09.07_2x

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