Fix source attribute value for braviatv integration

[bieniu]

Breaking change

None

Proposed change

Currently, the source attribute of the entity is outside the source_list. For example, on my TV, source_list is HDMI 1, HDMI 2, HDMI 3/ARC, HDMI 4, AV/Component and source has value extInput:hdmi.

This PR changes the method of detecting the source. Based on the value uri selects the appropriate source from the source_list.

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

Example entry for configuration.yaml:

# Example configuration.yaml

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.
• 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
• The code has been formatted using Black (black --fast homeassistant tests)
• 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

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

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

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[probot-home-assistant]

Hey there @robbiet480, mind taking a look at this pull request as its been labeled with a integration (braviatv) you are listed as a codeowner for? Thanks!

[bieniu]

@dcnielsen90 Could you take a look?

[dcnielsen90]

Cool, just tested and looks good to me 👍

[springstan]

Looks good to me as well!
@bieniu should we include this in the beta as well? 😁

[bieniu]

@springstan Yes, of course 😄