Fix #3101: setting ship:control:mainthrottle wasn't being marked as non-neutral

-also fix wheel throttle trim mixup

Author: JonnyOThan

CHANGELOG.md

@@ -22,6 +22,7 @@
 - Fixed a few benign but annoying errors on game load [commit 1](https://github.com/KSP-KOS/KOS/commit/019950401b93de951a0aedfa5e696d07a56200e9) [commit 2](https://github.com/KSP-KOS/KOS/commit/adb4dee40df86c19ff0f8623e3201ce134de741e)
 - Removed Infernal Robotics addon because it hasn't worked in several years.  A separate addon mod will be created later: https://github.com/ksp-kos/kos-ir
 - Fixed quaternion constructor ordering when loading from a dump (thanks @DBooots) [pr](https://github.com/KSP-KOS/KOS/pull/3165)
+- Fixed setting `ship:control:mainthrottle` without any other controls not being detected as an input
 
 ## 1.5.1.0 - 2025-02-06
 

src/kOS/Suffixed/FlightControl.cs

@@ -10,6 +10,7 @@
 using Math = System.Math;
 using kOS.Communication;
 using kOS.Control;
+using Smooth.Delegates;
 
 namespace kOS.Suffixed
 {
@@ -271,13 +272,15 @@ private void ResetControls()
             wheelSteerTrim = default(float);
             wheelThrottle = default(float);
             wheelThrottleTrim = default(float);
+            mainThrottle = default(float);
         }
 
         private BooleanValue IsNeutral()
         {
             return (yaw == yawTrim && pitch == pitchTrim && roll == rollTrim &&
                 fore == 0 && starboard == 0 && top == 0 &&
-                wheelSteer == wheelSteerTrim && wheelThrottle == wheelSteerTrim);
+                mainThrottle == 0 &&
+                wheelSteer == wheelSteerTrim && wheelThrottle == wheelThrottleTrim);
         }
 
         private void OnFlyByWire(FlightCtrlState st)