set commanded speed to 0 during off transition

mission/acs/RwHandler.cpp

@@ -55,6 +55,10 @@ void RwHandler::doShutDown() {
     PoolReadGuard pg(&tmDataset);
     tmDataset.setValidity(false, true);
   }
+  {
+    PoolReadGuard pg(&rwSpeedActuationSet);
+    rwSpeedActuationSet.setRwSpeed(0, 10);
+  }
   // The power switch is handled by the assembly, so we can go off here directly.
   setMode(MODE_OFF);
 }