Fix invalid schemas

[cdce8p]

Proposed change

Refs #120268

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[janiversen]

The modbus changes looks very strange, the schema is old and is being used without problems.

I am not what side effects your changes might have, but please explain why the current working scheme in invalid (even though it works), and your changes are ok (even without tests proving that they provide a valid solution).

Test cases showing one schema being invalid while the other is valid, should be added.

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[cdce8p]

The modbus changes looks very strange, the schema is old and is being used without problems.

I did the modbus change because of the typing for vol.Maybe. The validator is typed to be a Callable.
https://github.com/alecthomas/voluptuous/blob/0.15.0/voluptuous/validators.py#L597

However, looking closer at it, the dict is ultimately passed to schema._compile which converts it to a valid schema. Wrapping it with vol.Schema would have been a no-op. I'll open a PR to fix the typing upstream. Reverted the modbus change here.

modbus changes were removed from this PR

[janiversen]

Modbus change reverted so ok for that part.

[bdraco]

Thanks @cdce8p @janiversen

[cdce8p]

Upstream PR to remove the wrong type from vol.Maybe: alecthomas/voluptuous#517