Delete unused multithreading macro

The macro CADET_PARFOR_END extends to a closed bracket when the project
is build with multithreading enabled. This causes issues in some
environments (build failed on MacOS), when the corresponding opening
bracket is not defined.
This commit deletes unused CADET_PARFOR_END statements.

src/libcadet/model/LumpedRateModelWithPoresDG2D.cpp

@@ -1175,7 +1175,7 @@ int LumpedRateModelWithPoresDG2D::residualImpl(double t, unsigned int secIdx, St
 			const unsigned int par = (pblk - 1) % (_disc.axNPoints * _disc.radNPoints);
 			residualParticle<StateType, ResidualType, ParamType, wantJac, wantRes>(t, type, par, secIdx, y, yDot, res, threadLocalMem);
 		}
-	} CADET_PARFOR_END;
+	}
 
 	residualFlux<StateType, ResidualType, ParamType, wantJac, wantRes>(t, secIdx, y, yDot, res);
 
@@ -1398,7 +1398,7 @@ int LumpedRateModelWithPoresDG2D::residualSensFwdCombine(const SimulationTime& s
 		for (unsigned int i = 0; i < numDofs(); ++i)
 		{
 			ptrResS[i] = tmp1[i] + tmp2[i] + adRes[i].getADValue(param);
-		} CADET_PARFOR_END;
+		}
 
 		BENCH_STOP(_timerResidualSensPar);
 	}
@@ -1507,7 +1507,7 @@ void LumpedRateModelWithPoresDG2D::multiplyWithDerivativeJacobian(const Simulati
 					solidRet[bnd] = solidSdot[bnd];
 			}
 		}
-	} CADET_PARFOR_END;
+	}
 
 	// Handle inlet DOFs (all algebraic)
 	std::fill_n(ret, _disc.nComp, 0.0);