Do not call not existing start_feature method (fixes #629)

[tkratky]

Context

Test execution using behave is failing with the latest (2.9.45) allure-behave version on the following error:

HOOK-ERROR in before_feature: AttributeError: 'AllureListener' object has no attribute 'start_feature'
  File "<project-path>/venv/lib/python3.9/site-packages/behave/runner.py", line 564, in run_hook
    self.hooks[name](context, *args)
  File "<project-path>/venv/lib/python3.9/site-packages/allure_behave/hooks.py", line 22, in hook
    allured(*args, **kwargs)
  File "<project-path>/venv/lib/python3.9/site-packages/allure_behave/hooks.py", line 53, in before_feature
    self.listener.start_feature()

#629

Checklist

• Sign Allure CLA
• Provide unit tests

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