Formatting filesystem asks to proceed if fs already exists

[NiKiZe]

If install is done multiple times on same disk this question appears.
It is nice to have in some cases, but we probably want to skip it, investigate how.

Or maybe detect it and deal with it a bit nicer than what we do now.

/dev/sda3 contains a ext4 file system
last mounted on / on ....
Proceed anyway? (y,N)

https://forums.gentoo.org/viewtopic-t-995558-start-0.html