Fix: `call_module` argument conversion

The second argument of call_module cause a type error. This fixes this issue.

src/vasingletonmethods.hpp

@@ -336,7 +336,7 @@ static PyObject* call_module( PyObject*, PyObject* pArgs, PyObject* pKeywordTupl
 	VAPY_REQUIRE_CONN_TRY;
 
 	static char* pKeyWordList[] = { "module_name", "arguments_dict", NULL };
-	const char* pcFormat        = "sO!:call_module";
+	const char* pcFormat        = "sO:call_module";
 	char* pcModuleName          = nullptr;
 	PyObject* pArgumentsDict    = nullptr;