rm class_db.h from resource.h

modules/gdscript/gdscript_disassembler.cpp

@@ -33,6 +33,7 @@
 #include "gdscript.h"
 #include "gdscript_function.h"
 
+#include "core/object/class_db.h"
 #include "core/string/string_builder.h"
 
 static String _get_variant_string(const Variant &p_variant) {