fix MassScalarSurfaceTerm for surface fields
fix MassScalarSurfaceTerm for surface fields

vlukes/sfepy,lokik/sfepy,lokik/sfepy,RexFuzzle/sfepy,sfepy/sfepy,rc/sfepy,BubuLK/sfepy,vlukes/sfepy,vlukes/sfepy,BubuLK/sfepy,rc/sfepy,RexFuzzle/sfepy,rc/sfepy,sfepy/sfepy,lokik/sfepy,sfepy/sfepy,RexFuzzle/sfepy,lokik/sfepy,RexFuzzle/sfepy,BubuLK/sfepy