Fix running

DLASystem.cpp

@@ -13,6 +13,8 @@ void DLASystem::Update() {
     } else if (numParticles < endNum) {
         addParticleOnAddCircle();
         setParticleActive();
+    } else {
+        this->running = false;
     }
 }
 

mainDLA.cpp

@@ -17,7 +17,7 @@ int main(int argc, char **argv) {
     int seed = 6;
     cout << "setting seed " << seed << endl;
     sys->setSeed(seed);
-    sys->setRunning();
+    sys->running = true;
 
     /*
      * NOTE: We run at max speed as rendering is handled by a different engine so we simply want to hjand