vfs_fruit: lp_case_sensitive() does not return a bool

vfs_fruit: lp_case_sensitive() does not return a bool

lp_case_sensitive() returns an int, not a bool, so with the default
setting of "Auto" by default we set the AAPL flag
SMB2_CRTCTX_AAPL_CASE_SENSITIVE.

This caused the client to believe the volume is case sensitive where it
wasn't, leading to an error when trying to rename files changing only
the case of the name.

Also fix the existing torture test that verifies AAPL context
negotiation and actually expected the server to return "case sensitive",
while the Samba default is really "case insensitive".

Bug: https://bugzilla.samba.org/show_bug.cgi?id=12749

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>