BETA for MyBMW API: Fix vehicle updates + cli image command

• Fix vehicles not updating in Home Assistant (status was not overwritten but appended)
• Fix cli image command

Please see previous changelogs as well:

• https://github.com/bimmerconnected/bimmer_connected/releases/tag/0.8.0b6
• https://github.com/bimmerconnected/bimmer_connected/releases/tag/0.8.0b5
• https://github.com/bimmerconnected/bimmer_connected/releases/tag/0.8.0b4
• https://github.com/bimmerconnected/bimmer_connected/releases/tag/0.8.0b2 (includes breaking changes)