[Backtracing] Fix Python test failure.

We needed to add `--enable-runtime-module` in the Python test scripts.

rdar://124913332

Author: al45tair

utils/build_swift/tests/expected_options.py

@@ -630,6 +630,7 @@ class BuildScriptImplOption(_BaseOption):
     EnableOption('--enable-experimental-observation'),
     EnableOption('--enable-experimental-parser-validation'),
     EnableOption('--enable-lsan'),
+    EnableOption('--enable-runtime-module'),
     EnableOption('--enable-sanitize-coverage'),
     EnableOption('--enable-tsan'),
     EnableOption('--enable-tsan-runtime'),