Fis Multi-Mode Engine toggling

Stupid indexing error that I missed.  Reporteed and diagnosed by vulkans22.  Issue #324

Author: MOARdV

Source/MASFlightComputerProxy.cs

@@ -4636,7 +4636,7 @@ public double SetGimbalYaw(bool enable)
         public double SetMultiModeEngineMode(bool runPrimary)
         {
             bool anyChanged = false;
-            for (int i = vc.multiModeEngines.Length; i >= 0; --i)
+            for (int i = vc.multiModeEngines.Length - 1; i >= 0; --i)
             {
                 if (vc.multiModeEngines[i].runningPrimary != runPrimary)
                 {
@@ -4645,6 +4645,11 @@ public double SetMultiModeEngineMode(bool runPrimary)
                 }
             }
 
+            if (anyChanged)
+            {
+                vc.InvalidateModules();
+            }
+
             return (anyChanged) ? 1.0 : 0.0;
         }
 
@@ -4817,10 +4822,13 @@ public double ToggleGimbalYaw()
         /// <returns>1 if any engines were toggled, 0 if no multi-mode engines are installed.</returns>
         public double ToggleMultiModeEngineMode()
         {
-            for (int i = vc.multiModeEngines.Length; i >= 0; --i)
+            for (int i = vc.multiModeEngines.Length - 1; i >= 0; --i)
             {
                 vc.multiModeEngines[i].ToggleMode();
             }
+
+            vc.InvalidateModules();
+
             return (vc.multiModeEngines.Length > 0) ? 1.0 : 0.0;
         }
         #endregion

Source/MASVesselComputerModules.cs

@@ -1371,7 +1371,7 @@ private void UpdateGear()
         /// Mark modules as potentially invalid to force reiterating over the
         /// part and module lists.
         /// </summary>
-        private void InvalidateModules()
+        internal void InvalidateModules()
         {
             modulesInvalidated = true;
             camerasReset = true;