s3:smbd/filename remove smelly code

s3:smbd/filename remove smelly code

not sure how this chunk ended up there, but I agree with
the statement in the comment that behavior should not depend
on developer mode

make test does not seem to depend on it anymore.

This piece had some bad influence on the tests I wrote
for case insensitivite behavior of SMB2/3, so let us
remove this technical debt.

Signed-off-by: Christian Ambach <ambi@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>