ENH: add PLA-AERO,add default key in common json

Change-Id: Ia6551f50e0f921a196a3a94659b367ca1ec4424f

src/libslic3r/PrintConfig.cpp

@@ -1300,6 +1300,7 @@ void PrintConfigDef::init_fff_params()
     def->enum_values.push_back("PETG-CF");
     def->enum_values.push_back("PVA");
     def->enum_values.push_back("HIPS");
+    def->enum_values.push_back("PLA-AERO");
     def->mode = comSimple;
     def->set_default_value(new ConfigOptionStrings { "PLA" });