Fix default behaviour for init function in AppriseNotifier

[rrr2rrr]

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Fixed default behaviour for init send_apprise_notification from airflow.providers.apprise.notifications.apprise

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[eladkal]

Tests are failing

[eladkal]

@rrr2rrr can you please fix the test?
FAILED tests/providers/apprise/notifications/test_apprise.py::TestAppriseNotifier::test_notifier - AssertionError: expected call not found.

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