Allow None connector for BaseHaRemoteScanner

[akx]

Proposed change

BaseHaRemoteScanner's superclass BaseHaScanner allows connector to be None, but the subclass doesn't.

I'm implementing support for a decidedly non-connectable, polling remote scanner.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

Hey there @bdraco, mind taking a look at this pull request as it has been labeled with an integration (bluetooth) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of bluetooth can trigger bot actions by commenting:

• @home-assistant close Closes the issue.
• @home-assistant rename Awesome new title Change the title of the issue.
• @home-assistant reopen Reopen the issue.
• @home-assistant unassign bluetooth Removes the current integration label and assignees on the issue, add the integration domain after the command.