originalUrl changed after upgrading from 3.4.0 to 4.10.1

Hit a problem upgrading from 3.4.0 to 4.10.1. I referenced your UPGRADE.md and examples.

Using aws-serverless-express@3.4.0, my url path for a particular REST GET call gets resolved to /profiles/envConfig/client-config-v1 as expected. I have some code at that routed path. It works.

Once I upgrade to @vendia/serverless-express@4.10.1, that same REST GET call unexpectedly gets resolved to /envConfig/client-config-v1, and since I don't manage that path, the call returns an error message: Cannot GET /envConfig/client-config-v1.

Any insight into what would cause the change in url path on the node serverless-express side? Wondering if no longer using app.use(middleware.eventContext()) or awsServerlessExpress.proxy changes url path resolution?

I'm providing essential code snippets. Any thoughts would be most appreciated. Thanks.

---

CODE using aws-serverless-express@3.4.0 works as expected.

index.js
```
const awsServerlessExpress = require('aws-serverless-express');
const app = require('./app');
const server = awsServerlessExpress.createServer(app);
exports.handler = (event, context) =>
awsServerlessExpress.proxy(server, event, context, 'PROMISE').promise;
```

app.js
```
const express = require('express');
const middleware = require('aws-serverless-express/middleware');
const bodyParser = require('body-parser');

const app = express();
app.use(bodyParser.json());
app.use(middleware.eventContext());

app.get('/profile/envConfig/:envConfigId', async (req, res, next) => {
// this works since url is /profiles/envConfig/client-config-v1
}

app.listen(3000);
module.exports = app;
```

Some console debug output:
```
res: {
url: '/profiles/envConfig/client-config-v1',
originalUrl: '/profiles/envConfig/client-config-v1',
_parsedUrl.path: '/profiles/envConfig/client-config-v1',
apiGateway: {
event: {
resource: '/profiles/{proxy+}',
path: '/profiles/envConfig/client-config-v1',
httpMethod: 'GET',
...
},
}
...
}
```

---

CODE using @vendia/serverless-express@4.10.1 fails. Fails whether I use the built-in router or instantiate my own app.Router().

index.js
```
const serverlessExpress = require('@vendia/serverless-express');
const app = require('./app');
exports.handler = serverlessExpress({ app });
```

app.js
```
const express = require('express');
const { getCurrentInvoke } = require('@vendia/serverless-express');
const bodyParser = require('body-parser');

const app = express();
const router = express.Router();
router.use(bodyParser.json());

router.get('/profiles/envConfig/:envConfigId', async (req, res, next) => {
// this doesn't get called since path does not match
const currentInvoke = getCurrentInvoke();
...
}

app.use('/', router);
module.exports = app;
```

Some console debug output:
```
res: {
url: '/envConfig/client-config-v1',
baseUrl: '',
originalUrl: '/envConfig/client-config-v1',
_parsedUrl.path: '/envConfig/client-config-v1',
}
```