HID: multitouch: fix support for Goodix PID 0x01e9

Commit c8000deb ("HID: multitouch: Add support for GT7868Q") added
support for 0x01e8 and 0x01e9, but the mt_device[] entries were added
twice for 0x01e8 and there was none added for 0x01e9. Fix that.

Fixes: c8000deb ("HID: multitouch: Add support for GT7868Q")
Reported-by: He Lugang <helugang@uniontech.com>
Reported-by: WangYuli <wangyuli@uniontech.com>
Reported-by: Ulrich Müller <ulm@gentoo.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>