BUG: fix VTK rendering when framerate not fixed

When the framerate was not fixed, the next render pass
would be called using `CreateOneShotTimer(0)` while its
parameter minimum value is 1 (in milliseconds). 0 would
set it up for the default value of 10 ms.

Base/SimulationManager/imstkVTKInteractorStyle.cpp

@@ -73,7 +73,7 @@ VTKInteractorStyle::OnTimer()
     }
     else
     {
-        this->Interactor->CreateOneShotTimer(0);
+        this->Interactor->CreateOneShotTimer(1);
     }
 
     // Timing info