Fix brightness_pct in light device turn_on action

[frenck]

Proposed change

When creating a device automation in the frontend, the frontend UI, that turns on a light, and sets a brightness; The brightness and brightness_pct properties are mixed up.

The UI input allows a user to select a value using a slider that reaches from 0-100, while the brightness property is used, which has a range from 0-255.

2 way to fix this:

• Adjust the range
• Use pct version of the property

From a user UI perspective, the percentage makes more sense, so I opted to the latter.

PS: I have no clue how the translation works on our frontend and how to make this nicely translated (although I have the feeling this piece isn't translated at all?). Whatever the case, currently it shows brightness_pct in the interface, which is, of course, not that nice.

PR on the core repository addressing this: home-assistant/core#32787

Type of change

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

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

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

• Documentation added/updated for www.home-assistant.io