MAINTAINERS: remove non existent input mt git tree

The "INPUT MULTITOUCH (MT) PROTOCOL" entry git tree is not there on
git.kernel.org.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

MAINTAINERS

@@ -5043,7 +5043,6 @@ F:	include/linux/input/
 INPUT MULTITOUCH (MT) PROTOCOL
 M:	Henrik Rydberg <rydberg@bitmath.org>
 L:	linux-input@vger.kernel.org
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/rydberg/input-mt.git
 S:	Odd fixes
 F:	Documentation/input/multi-touch-protocol.txt
 F:	drivers/input/input-mt.c