sensors: hide last value of the COL-CAL mode

It seems that this value is always zero - it
is not even shown in the test calibration application
on the stock firmware.

Signed-off-by: Jakub Vanek <linuxtardis@gmail.com>

Author: JakubVanek

sensors/ev3_uart_sensor_defs.c

@@ -190,6 +190,7 @@ const struct ev3_uart_sensor_info ev3_uart_sensor_defs[] = {
 				 */
 				.name		= "COL-CAL",
 				.data_sets	= 4,
+				.num_values	= 3,
 				.data_type	= LEGO_SENSOR_DATA_S32,
 			},
 		},