bug: broken layout after opening 3 or more tabs

[maciekk64]

https://github.com/pop-os/cosmic-files/assets/153014021/99d7ce9c-7c92-430f-b89d-93592b6ae0b2

[jackpot51]

I think this is a bug in libcosmic's tab widget. I see the state for the top tab being used even when it is not selected.

cc @wash2 @mmstick