Input: ALPS - fix sync loss on Acer Aspire 5720ZG

The recently added support for Dell Volstro 1400 was causing protocol
synchronization errors on Acer Aspire 5720ZG, fix it.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/mouse/alps.c

@@ -54,7 +54,7 @@ static const struct alps_model_info alps_model_data[] = {
 	{ { 0x20, 0x02, 0x0e },	0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT }, /* XXX */
 	{ { 0x22, 0x02, 0x0a },	0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },
 	{ { 0x22, 0x02, 0x14 }, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT }, /* Dell Latitude D600 */
-	{ { 0x73, 0x02, 0x50 }, 0xcf, 0xff, ALPS_FW_BK_1 } /* Dell Vostro 1400 */
+	{ { 0x73, 0x02, 0x50 }, 0xcf, 0xcf, ALPS_FW_BK_1 } /* Dell Vostro 1400 */
 };
 
 /*