Remove unused create_script method from ScriptLanguage

modules/gdscript/gdscript_editor.cpp

@@ -246,10 +246,6 @@ int GDScriptLanguage::find_function(const String &p_function, const String &p_co
 	return -1;
 }
 
-Script *GDScriptLanguage::create_script() const {
-	return memnew(GDScript);
-}
-
 /* DEBUGGER FUNCTIONS */
 
 thread_local int GDScriptLanguage::_debug_parse_err_line = -1;