Gmt module: Remove another std::move from Parameter class.

modules/gmt/modgmt_param.h

@@ -66,7 +66,7 @@ class Parameter
  const ValueType& Value() {return val;}
  const ValueType* operator->() const {return &val;}
  operator const ValueType&() {return val;}
- void Reset() {initialised=false; val=std::move(Adapter<CheckDefault<Converter>::value>::Val(conv));}
+ void Reset() {initialised=false; val=Adapter<CheckDefault<Converter>::value>::Val(conv);}
 
  static constexpr bool optional=Optional;
  using ConverterType=Converter;