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/rpc_named_arguments.py

@@ -35,4 +35,4 @@ class NamedArgumentTest(BitcoinTestFramework):
         assert_raises_rpc_error(-8, "Parameter arg1 specified twice both as positional and named argument", node.echo, 0, None, 2, arg1=1)
 
 if __name__ == '__main__':
-    NamedArgumentTest().main()
+    NamedArgumentTest(__file__).main()