Use string formatting and remove already global disabled pylint issue

[fabaff]

Description:

Use string formatting and remove already global disabled pylint issue

Example entry for configuration.yaml (if applicable):

sensor:
  - platform: mvglive
    station: Marienplatz
    line: U6
    offset: 5
    destination: Garching-Forschungszentrum

Checklist:

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

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass