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_dirsymlinks.py

@@ -38,4 +38,4 @@ class SymlinkTest(BitcoinTestFramework):
 
 
 if __name__ == "__main__":
-    SymlinkTest().main()
+    SymlinkTest(__file__).main()