Fix incorrect column count when app zoom level set

[whyboris]

The number of videos per gallery row works as desired, but if you use the "Zoom" feature (to increase the size of the UI) it seems that upon starting the app, the number of videos per row is one less.

Play around replicating the problem and then fix 🤞

[Nat-FL]

Hello! I am interested in working on this issue if that is okay.

[whyboris]

Thank you @Nat-FL for the offer 😁

Please let me know if you'd like any pointers about where to look in the code 🤝 or any other advice.

Cheers 🥳