add second encoder to matrix info of arrowmechanics/wings

[dunk2k]

Description

#23330 fixed defining encoder on right side of split keyboard in layouts literal object within info.json.
This PR adds second encoder to right side of split keyboard arrowmechanics/wings.

cc: @philvec

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

• n/a

Checklist

• 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.
• 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).

[arrowmechanics]

wonderful