bug: OpenAPM not masking the path in some cases

Describe the bug

After instrumenting the express app. In some cases OpenAPM is not masking the paths using openapm.instrument('express') signature. The paths in the screenshot should be prefixed with /org/:orgId/

To Reproduce
Steps to reproduce the behavior:

1. Generate a demo express application using npx express-generator
2. Use openapm.instrument('express') as per the documentation
3. Create a router and use a parameter in the base path
4. Start the application and make calls to the paths initialized in the router.
5. localhost:9097/metrics won't have a parameterised routes.

Expected behavior
The paths should be parameterized like it is in the screenshot. When the middleware is used directly like this
app.use(openapm.REDMiddleware); the behaviour seems to be as expected.