Align Defaults with Proxmox Defaults

[maxexcloo]

Is your feature request related to a problem? Please describe.
I've noticed that when I create a new VM using the UI and a new VM using Terraform the defaults don't match (or show differently in the UI when switching between even for the same value). It would be good to have these match.

Describe the solution you'd like
Defaults match the defaults from the Proxmox UI.

Describe alternatives you've considered
Manually setting values, however these do not show as default and are thus shown differently in the UI.

Additional context
Awesome plugin, has been a huge help 💯

[bpg]

That's another known long standing issue.
I can't do much in the current implementation, unfortunately. Will be addressed in #1231.

Also in #566