Remove the check for FILE_WRITE_ATTRIBUTES from smb_set_file_time(). It

Remove the check for FILE_WRITE_ATTRIBUTES from smb_set_file_time(). It
is called from places like fileio.c that need to update the write time
on a file handle only open for write, without neccessarily having
FILE_WRITE_ATTRIBUTES permission. Move all checks to before the
smb_set_file_time() callers.