Fix homeassistant.log showing debug level logs by default

[fabianflanhardt]

Setting LOGGER and handler level to DEBUG by default causes lots of DEBUG level entries coming from this extension by default. DEBUG log entries cannot be disabled by changing the log level in configuration.,yaml

Removing the lines below from constants enables the following log behavior:

• Debug Entries are not logged by default
• Setting log level for this extension in configuration.yaml to debug makes debug level entries appear in homeassistant.log.

[fabianflanhardt]

Hey @tahvane1, can you have a look at this PR and merge if the change is OK for you?