Rover: Copter: remove pilot_throttle_checks()

This method is redundant as radio_failsafe_check() takes care of below acceptable value of throttle.

Rover/AP_Arming.cpp

@@ -89,8 +89,7 @@ bool AP_Arming_Rover::pre_arm_checks(bool report)
             & motor_checks(report)
             & oa_check(report)
             & parameter_checks(report)
-            & mode_checks(report)
-            & pilot_throttle_checks(report));
+            & mode_checks(report));
 }
 
 bool AP_Arming_Rover::arm_checks(AP_Arming::Method method)
@@ -189,19 +188,6 @@ bool AP_Arming_Rover::parameter_checks(bool report)
     return true;
 }
 
-// check throttle is above failsafe throttle
-bool AP_Arming_Rover::pilot_throttle_checks(bool report)
-{
-    if ((checks_to_perform == ARMING_CHECK_ALL) || (checks_to_perform & ARMING_CHECK_RC)) {
-        if (rover.g.fs_throttle_enabled != FS_THR_DISABLED && rover.channel_throttle->get_radio_in() < rover.g.fs_throttle_value) {
-            check_failed(ARMING_CHECK_RC, report, "Throttle below failsafe");
-            return false;
-        }
-    }
-
-    return true;
-}
-
 // check if arming allowed from this mode
 bool AP_Arming_Rover::mode_checks(bool report)
 {

Rover/AP_Arming.h

@@ -32,6 +32,5 @@ protected:
     bool parameter_checks(bool report);
     bool mode_checks(bool report);
     bool motor_checks(bool report);
-    bool pilot_throttle_checks(bool report);
 
 };