Fix #22648 - Utility_meter would try to cancel a non existing task

[dgomes]

Description:

This is a bug fix for utility_meters with more than 2 tariffs.

Related issue (if applicable): fixes #22648

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#<home-assistant.io PR number goes here>

Example entry for configuration.yaml (if applicable):

utility_meter:
  sonoff_1000384783_daily_energy_consumption:
    source: sensor.sonoff_1000384783_energy
    cycle: daily
    tariffs:
      - onpeak
      - midpeak
      - offpeak

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.

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

• Documentation added/updated in home-assistant.io

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

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.