New icon is too big

[nkkowa]

The new icon is a bit big and doesn't line up well with other icons. Perhaps standardize with the spacing from the Terraform extension.

[radeksimko]

Hi @nkkowa
Unfortunately this is a side effect of what I'd consider a bug in VS Code, where extension-contributed icons are treated differently from the builtin ones. I originally raised this in microsoft/vscode#154492 but it seems that VS Code folks aren't too keen to address that.

The Terraform icon is actually built into seti-ui (library used by VS Code to render icons which otherwise aren't provided by extensions), whereas the HCL icon is provided by the HCL extension.

I tried to play with various different paddings and margins in the SVG, but I wasn't able to align it in any way. I think the best course of action would therefore be contributing the HCL icon into seti-ui, so they both use the same styling rules.

[radeksimko]

btw. We could also contribute Packer icon to seti, which was the context of the original PR as submitted by @bmalehorn
#151