remove remaining state from Convert

pvDataApp/factory/Convert.cpp

@@ -45,7 +45,6 @@ static std::vector<String> split(String commaSeparatedList) {
 }
     
 Convert::Convert()
-: pvDataCreate(getPVDataCreate())
 {}
 
 

pvDataApp/pv/convert.h

@@ -819,7 +819,6 @@ public:
     void newLine(StringBuilder buf, int indentLevel);
 private:
     Convert();
-    PVDataCreatePtr pvDataCreate;
 };
 
 static inline ConvertPtr getConvert() { return Convert::getConvert(); }