Fix binding equations for parameters in Modelica.Fluid.Pipes.BaseClasses.FlowModels.{PartialGenericPipeFlow, DetailedPipeFlow} (See #1203)

git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@6820 7ce873d0-865f-4ce7-a662-4bb36ea78beb