Fix coverity issue:

* CID 332682: Resource leak
* CID 350607: Resource leak
* CID 332677: Resource leak

src/Mod/Spreadsheet/App/AppSpreadsheet.cpp

@@ -19,6 +19,7 @@
 #include <CXX/Objects.hxx>
 
 #include <Base/Console.h>
+#include <Base/Interpreter.h>
 #include <Base/PyObjectBase.h>
 #include "Sheet.h"
 
@@ -38,7 +39,7 @@ private:
 
 PyObject* initModule()
 {
-    return (new Module)->module().ptr();
+    return Base::Interpreter().addModule(new Module);
 }
 } // namespace Spreadsheet