MSCFModel_CC: avoid setting chosing the speed factor when using a fix…

…ed acceleration

This avoids problems if the user sets the CC desired speed to 0 by chance

src/microsim/cfmodels/MSCFModel_CC.cpp

@@ -281,7 +281,7 @@ MSCFModel_CC::finalizeSpeed(MSVehicle* const veh, double vPos) const {
         }
     }
 
-    if (vars->activeController != Plexe::DRIVER) {
+    if (vars->activeController != Plexe::DRIVER && !vars->useFixedAcceleration) {
         veh->setChosenSpeedFactor(vars->ccDesiredSpeed / veh->getLane()->getSpeedLimit());
     }