hydreon_rgxx - fix missing cg.add(var.set_model(...))

[mrtoy-me]

What does this implement/fix?

cg.add(var.set_model(config[CONF_MODEL])) is omitted from sensor.py, so the configured model (required) is not passed through.
The default model is defined in .h file as RG_9, so RG_9 models are not affected. When RG_15 is configured, the bug is not easily evident because the configuration command for polling mode is the same for RG_9 and RG15. However, the configuration of units as mm and resolution as high is never set for RG_15 as was intended - so the units and resolution are actually currently defined by the DIP switch settings of the RG_15.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

Related issue or feature (if applicable): fixes

Pull request in esphome-docs with documentation (if applicable): esphome/esphome-docs#

Test Environment

• ESP32
• ESP32 IDF
• ESP8266
• RP2040
• BK72xx
• RTL87xx

Example entry for config.yaml:

# Example config.yaml

Checklist:

• The code change is tested and works locally.
• Tests have been added to verify that the new code works (under tests/ folder).

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

• Documentation added/updated in esphome-docs.

[probot-esphome]

Hey there @functionpointer, mind taking a look at this pull request as it has been labeled with an integration (hydreon_rgxx) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[codecov-commenter]

Codecov Report

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Additional details and impacted files

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[functionpointer]

Tested with RG-9 - works

[jesserockz]

Thanks @mrtoy-me