fix async_get_last_action_log_entry in coordinator.py

[danielcaceresm]

The method async_get_last_action_log_entry is called from entity file and it fails due the method in coordinator has a leading underscore (as non-public member). I changed the method name to fix the issue.

[ronengr]

Thanks, i missed this.
Isn't it easier to change the call in the entity file to await self.coordinator._async_get_last_action_log_entry() instead of changing the function name?
this way the linter won't complain about docstring

[ronengr]

although maybe it is more "correct" to just add the docstring so the linter will be happy :-)

[danielcaceresm]

I just added it!