HID: lg: restrict filtering out of first interface to G29 only

Looks like 29fae1c8 ("HID: logitech: Add support for G29") was a little
bit aggressive and broke other devices.

Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=108121



Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>