samples: remove duplicate include in fs-monitor.c

'sys/types.h' included in 'samples/fanotify/fs-monitor.c'
is duplicated.It is also included on 15 line.

Link: https://lore.kernel.org/r/20211101075152.35780-1-zhang.mingyu@zte.com.cn


Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Zhang Mingyu <zhang.mingyu@zte.com.cn>
Signed-off-by: Jan Kara <jack@suse.cz>