Guard both Shelly 2 & Shelly 2.5 in roller mode

[thecode]

Breaking change

Proposed change

Shelly 2 in roller mode do not have relay blocks with output values.

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)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

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• This PR fixes or closes issue: fixes #
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[probot-home-assistant]

Hey there @balloob, @bieniu, mind taking a look at this pull request as its been labeled with an integration (shelly) you are listed as a codeowner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[thecode]

@bieniu Thanks, your suggestion looks more clear and will allow adding more devices easily.

[bieniu]

LGTM 👍