Fix bug with monitored_conditions in Ambient PWS

[bachya]

Description:

A bug existed in the Ambient PWS component where monitored_conditions would be stored in the config entry. Those values would then be used on every load, regardless of any value changes in configuration.yaml. This PR fixes that.

Related issue (if applicable): N/A

Pull request in home-assistant.io with documentation (if applicable): N/A

Example entry for configuration.yaml (if applicable):

ambient_station:
  api_key: !secret ambient_pws_api_key
  app_key: !secret ambient_pws_app_key

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.