Fix: space indent in Mango Query editor doesn't match the indent guides

[Antonio-Maranhao]

Overview

The Mango query editor was using a 3-space indent, which doesn't match the indent guides drawn in the editor (2 spaces). This PR updates the formatter so both use 2-space ident.

Before

After

Testing recommendations

Run Fauxton and verify the indent guide line up with the formatted text.

GitHub issue number

https://github.com/apache/couchdb-fauxton/issues/1313

Related Pull Requests

n/a

Checklist

• [x] Code is written and works correctly;
• [ ] Changes are covered by tests;
• [ ] Documentation reflects the changes;
• [ ] Update rebar.config.script with the correct tag once a new Fauxton release is made