HID: remove duplicate ID for D-WAV eGalax 0x7224

This patch also removes the duplicate entry in the hid-multitouch.c as
suggested by Benjamin Tissoires.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>