Remove default import of wizard in module template

It is encouraged to use button to launch wizards, so the scenario should not
need it too often.

cookiecutter-module/{{ cookiecutter.module_name }}/tests/{% if cookiecutter.test_with_scenario %}scenario_{{ cookiecutter.module_name }}.rst{% endif %}

@@ -4,7 +4,7 @@
 
 Imports::
 
-    >>> from proteus import Model, Wizard
+    >>> from proteus import Model
     >>> from trytond.tests.tools import activate_modules
 
 Activate modules::