[0.4.7][FREELDR] i386vid.c: Downgrade 3 ERR() to WARN(). CORE-13496

[0.4.7][FREELDR] i386vid.c: Downgrade 3 ERR() to WARN(). CORE-13496

which effectively mutes them.
Silence harmless errors, which can be reported at every boot.
And do get logged even before the "-------------" reboot-delimiter.

inspired by 0.4.8-dev-875-g b5a7765068852311932f9d1a5e688efb8c4c8060
I decided to just switch to WARN for the backport,
but to not enlarge the strings contents/lengths.