Fix Squeezebox discovery

[pavoni]

Description:

At least on my system the discovery_info is a dictionary - rather than array.

This used to work - and broke a couple of releases ago.

Did the format from netdisco change?

Related issue (if applicable): fixes #

Pull request in home-assistant.github.io with documentation (if applicable): home-assistant/home-assistant.github.io#<home-assistant.github.io PR number goes here>

Example entry for configuration.yaml (if applicable):

Checklist:

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.github.io

If the code communicates with devices, web services, or third-party tools:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

If the code does not interact with devices:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• Tests have been added to verify that the new code works.

[mention-bot]

@pavoni, thanks for your PR! By analyzing the history of the files in this pull request, we identified @fabaff, @persandstrom and @dasos to be potential reviewers.

[balloob]

I know that for netdisco that we're working on migrating to hashes, guess we didn't update the discovery in HASS when changing the netdisco side.

Thanks 🐬

[balloob]

cherry-picked for 0.40