Correct the energy equation of ThermalTwoPhaseFlowPP and related benchmark results

Merged Boyan Meng requested to merge boyanmeng/ogs:TH2PP_heat_eqn into master

The original FEM assembly of the energy balance equation came with several mishandlings. After this fix, the agreement of the heat pipe benchmark with analytical solution is much better.


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Edited by Boyan Meng

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