MAINTAINERS: remove Dmitry Torokhov's alternate address

I am using gmail.com exclusively and mail.ru was a backup that so far was
not needed. To avoid getting 2 copies of the same message let's drop
mail.ru from MAINTAINERS file.
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

MAINTAINERS

@@ -4698,7 +4698,6 @@ F:	include/uapi/linux/inotify.h
 
 INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN) DRIVERS
 M:	Dmitry Torokhov <dmitry.torokhov@gmail.com>
-M:	Dmitry Torokhov <dtor@mail.ru>
 L:	linux-input@vger.kernel.org
 Q:	http://patchwork.kernel.org/project/linux-input/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git