fix: change defaults for Podman machine

[jeffmaury]

Fixes #3047

What does this PR do?

Changes the defaults when creating a new podman machine

Screenshot/screencast of this PR

What issues does this PR fix or reference?

Fixes #3047

How to test this PR?

Create a new Podman machine and see the results

[benoitf]

don't know if documentation is impacted ?

[afbjorklund]

You might want to consider having 4.000 GB as the default, instead of 4.096 GB ?

• Size units wrongly processed #3062

Another approach would be to use an even 4 GiB instead, that is: 4294967296 bytes.

"default": 4096000000,

[jeffmaury]

You might want to consider having 4.000 GB as the default, instead of 4.096 GB ?

* [Size units wrongly processed #3062](https://github.com/containers/podman-desktop/issues/3062)

Another approach would be to use an even 4 GiB instead, that is: 4294967296 bytes.

"default": 4096000000,

I think as we display quantities as MB or GB, I think the default should be 2000000000 (changed to 4000000000)

[afbjorklund]

I think as we display quantities as MB or GB, I think the default should be 2000000000 (changed to 4000000000)

As long as you have different defaults compared to podman machine CLI, that makes sense (simpler GUI sliders)

The scale factor needs to be change accordingly, so that it gets the right number of MiB to use (1907.3486328125).

The init default has 2147483648 bytes (2.000GiB), which is presented to the user by list as "2.147GB"