[Misc] Tidy up core_v2.py

[vicgwee]

After fixing #23 in https://github.com/nigelb/platform-apollo3blue/commit/9cb10982cc4f1153951402b4ece16e5e10ed60cf, needed to remove old implementation in core_v2.py

Also edited a typo and indentation in the same file.

[nigelb]

Thanks @vicgwee