Normalize on single quotes, msftidy error

This PR fixes up two recent module submissions, the Chromecast module (PR #1234) and the MongoDB module (PR #3430). These changes shouldn't cause any change in normal functionality -- the first is just to favor single quotes over double in the `initialize` method (and the `send_request_raw` calls), and the second is to correct a msftidy warning.

## Verification

- [ ] See that the affected modules load as normal
- [ ] See that the info for the modules is unchanged.