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_remove_pruned_files_on_startup.py

@@ -52,4 +52,4 @@ class FeatureRemovePrunedFilesOnStartupTest(BitcoinTestFramework):
         assert not os.path.exists(rev1)
 
 if __name__ == '__main__':
-    FeatureRemovePrunedFilesOnStartupTest().main()
+    FeatureRemovePrunedFilesOnStartupTest(__file__).main()