`kikoslab/kl90`: add additional layouts

[fauxpark]

Description

⚠ kikoslab/kl90: "LAYOUT_all" should be "LAYOUT" unless additional layouts are provided.

According to the VIA JSON, the placement of the ISO \| key was incorrect.

This board also comes in hotswap and solder flavours, the former of which only supports ANSI. It should probably therefore be split in two, but for the moment I've just added both layout sets to the existing keyboard.json.

This page was useful in determining the possible layouts of both versions: https://mattj.io/posts/2021-12-16-kikos-lab-kl-90-fe-unbox/

Types of Changes

• [ ] Core
• [ ] Bugfix
• [ ] New feature
• [x] Enhancement/optimization
• [x] Keyboard (addition or update)
• [ ] Keymap/layout/userspace (addition or update)
• [ ] Documentation

Issues Fixed or Closed by This PR

Checklist

• [x] My code follows the code style of this project: C, Python
• [x] I have read the PR Checklist document and have made the appropriate changes.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] I have tested the changes and verified that they work and don't break anything (as well as I can manage).