lib/colors: fix fallback to system directory

lib/colors: fix fallback to system directory

The current check relies on "*sfile" to recognize if a configuration has
been found in the current directory. However this condition is only true
for "type == UL_COLORFILE_SCHEME", breaking the .enable and .disable
configurations.
Instead reorder the logic a bit so that any valid configuration returns
rc == 0.

Reported-by: Axel <axel.scheepers76@gmail.com>
Link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1094283
Reported-by: Chris Hofstaedtler <zeha@debian.org>
Link: https://lore.kernel.org/util-linux/Z5a08yD10L1J8AIa@per.namespace.at/
Tested-by: Chris Hofstaedtler <zeha@debian.org>
Fixes: 4bdf22803f9a ("lib/colors: ensure fallback to system directory")
Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>