Fix missing column for Herringbone

[ramonimbao]

Description

A Github user pointed out in an e-mail (Thanks!) that I had declared 15 columns in my matrix but only put 14 in the pins. This fixes it.

I also noticed in QMK Configurator that some keys in the F-row were 0.25 units too much the right. I edited json.info to address that.

Types of Changes

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

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• 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).

[zvecr]

Thanks!