[diffcoeff] Fix occurences of diffCoeff(p,p,c) using FS::getMainComponent
FluidSystem::getMainComponent returns the main componet index of the phase. This doesn't actually make sense for the tracer models which why this commit also * removes getMainComponent for tracer fluid systems (Changelog amended) * guards all occurences of getMainComponent in code that works for tracer too with constexpr if
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