Fix slow C++ pipeline due to bad flag
Fix slow C++ pipeline due to bad flag

The InsituLink is set to true at startup of the catalyst pipeline,
resulting in always updating the sources and filters. This only
needs to be done when actually connected to the ParaView client.

BioDynaMo/biodynamo,BioDynaMo/biodynamo,BioDynaMo/biodynamo,BioDynaMo/biodynamo