Copter: use battery.has_current method

ArduCopter/GCS_Mavlink.pde

@@ -226,7 +226,7 @@ static NOINLINE void send_extended_status1(mavlink_channel_t chan)
     int16_t battery_current = -1;
     int8_t battery_remaining = -1;
 
-    if (battery.monitoring() == AP_BATT_MONITOR_VOLTAGE_AND_CURRENT) {
+    if (battery.has_current()) {
         battery_remaining = battery.capacity_remaining_pct();
         battery_current = battery.current_amps() * 100;
     }

ArduCopter/compassmot.pde

@@ -76,7 +76,7 @@ static uint8_t mavlink_compassmot(mavlink_channel_t chan)
     init_compass();
 
     // default compensation type to use current if possible
-    if (battery.monitoring() == AP_BATT_MONITOR_VOLTAGE_AND_CURRENT) {
+    if (battery.has_current()) {
         comp_type = AP_COMPASS_MOT_COMP_CURRENT;
     }else{
         comp_type = AP_COMPASS_MOT_COMP_THROTTLE;

ArduCopter/sensors.pde

@@ -146,7 +146,7 @@ static void read_battery(void)
     battery.read();
 
     // update compass with current value
-    if (battery.monitoring() == AP_BATT_MONITOR_VOLTAGE_AND_CURRENT) {
+    if (battery.has_current()) {
         compass.set_current(battery.current_amps());
     }