python-remi: fix trailing whitespace and line size

Fixes line size in Config.in, trailing whitespace after # and empty line

Fixes:
 - https://gitlab.com/buildroot.org/buildroot/-/jobs/50971692



Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>