fs/ntfs3: Fix the format of the "nocase" mount option

The 'nocase' option was mistakenly added as fsparam_flag_no
with the 'no' prefix, causing the case-insensitive mode to require
the 'nonocase' option to be enabled.

Fixes: a3a956c7 ("fs/ntfs3: Add option "nocase"")
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>