[Bug]: Aspect Ratio>Auto option produces a stretched image that doesn't match the image displayed in the standalone Dolphin. Also, "Auto" should be the default as it is in the standalone Dolphin

[matheuswillder]

Platform

Linux

Renderer

Vulkan

Game exhibiting the issue

Any Wii game with a 16:9 aspect ratio, such as New Super Mario Bros. Wii

Describe the issue

As the title says, I was testing the new aspect ratio options from the PR #419 and noticed that selecting Aspect Ratio>Auto produces a stretched image that doesn't match the image displayed in the standalone Dolphin.

Dolphin core, Aspect Ratio>Auto, all the other settings as default:

Standalone Dolphin, default settings:

I haven't been able to do extensive testing, but GameCube games with a 4:3 aspect ratio don't seem to be affected, only Wii games with a 16:9 aspect ratio. The closest image to "normal" that I achieved was by selecting Aspect Ratio>Raw, which produces the following result:

Also, since Aspect Ratio: Auto is the default in the standalone Dolphin, I think it would make sense for the Dolphin core also set it as the default, although, of course, this is just a suggestion, as the important thing is that the user can choose what best suits their needs.

Log Output

I don't think the log is necessary since there's no crash, but since it's required by the template, here we go:
retroarch.log