scripted-diff: Add __file__ argument to BitcoinTestFramework.init()

-BEGIN VERIFY SCRIPT-
sed -i -e 's/\s*().main\s*()/(__file__).main()/' $(git ls-files test/functional/*.py)
sed -i -e 's/def __init__(self)/def __init__(self, test_file)/' test/functional/test_framework/test_framework.py
-END VERIFY SCRIPT-

test/functional/feature_versionbits_warning.py

@@ -100,4 +100,4 @@ class VersionBitsWarningTest(BitcoinTestFramework):
         self.wait_until(lambda: self.versionbits_in_alert_file())
 
 if __name__ == '__main__':
-    VersionBitsWarningTest().main()
+    VersionBitsWarningTest(__file__).main()