Python: Include unmarked Python file in snapshot

Sadly, it seems we're not interpreting this as Python code, even if we
explicitly ask to have it included.

Author: tausbn

python/ql/test/3/library-tests/modules/entry_point/no_py_extension/main renamed to python/ql/test/3/library-tests/modules/entry_point/no_py_extension/main.secretpy

@@ -1 +1 @@
-semmle-extractor-options: --lang=3 --path bogus -R .
+semmle-extractor-options: --lang=3 --path bogus -R . --filter=include:**/*.secretpy