Added PrimaryGenerator pointer deletion in destructor

Author: jackal1-66

Generators/include/Generators/GeneratorService.h

@@ -60,11 +60,6 @@ class GeneratorService
 {
 
  public:
-  ~GeneratorService()
-  {
-    o2::eventgen::GeneratorFactory::cleanup();
-  };
-
   void initService(std::string const& generatorName,
                    std::string const& triggerName,
                    VertexOption const& vtxOption);

run/O2PrimaryServerDevice.h

@@ -73,7 +73,7 @@ class O2PrimaryServerDevice final : public fair::mq::Device
       if (mControlThread.joinable()) {
         mControlThread.join();
       }
-      o2::eventgen::GeneratorFactory::cleanup();
+      delete mPrimGen;
     } catch (...) {
     }
   }