Remove empty consturctor and destructor from CudaStreamManager

> rule of zero

src/gpu/VirtualFluids_GPU/Parameter/CudaStreamManager.cpp

@@ -31,10 +31,6 @@
 #include <helper_cuda.h>
 #include <iostream>
 
-CudaStreamManager::CudaStreamManager() {}
-
-CudaStreamManager::~CudaStreamManager() {}
-
 void CudaStreamManager::launchStreams(uint numberOfStreams)
 {
     cudaStreams.resize(numberOfStreams);

src/gpu/VirtualFluids_GPU/Parameter/CudaStreamManager.h

@@ -44,9 +44,6 @@ private:
     const int bulkStreamIndex         = 0;
 
 public:
-    CudaStreamManager();
-    ~CudaStreamManager();
-
     void launchStreams(uint numberOfStreams);
     void terminateStreams();
     cudaStream_t &getStream(uint streamIndex);