externalCoupledTemperatureMixed → externalCoupledMixed Relation

File in src/functionObjects/field/externalCoupled/externalCoupledTemperatureMixed	Includes file in src/functionObjects/field/externalCoupled/externalCoupledMixed
externalCoupledTemperatureMixedFvPatchScalarField.H	externalCoupledMixedFvPatchFields.H