Have no screen isues with my galaxy S7 edge...Funny, there is no way in android to identify a rounded screen... That is going to cause some interesting design concerns as more phones get these rounded screens.
Anyway, I just finished a version that has a option under "settings - misc" called "Adjust for rounded corner screen".
It just adds some free space in the corners. Not necessarily matching the corner inset (because there is no way of telling how much is required), but that is all I can do.
This is a demo build so you can install in parallel without affecting your normal TelloFpv app.