The character `ij` is too wide in Mona Sans Mono

In Mona Sans Mono, the character `ij` appears to be about twice as wide as other characters.
Since Mona Sans Mono is a monospaced font, `ij` should occupy the same advance width as the other glyphs.

Start by locating the Mona Sans Mono glyph and font-source data for `ij`, then compare its advance width with the other monospaced characters. Done means the `ij` glyph occupies the same advance width as the surrounding glyphs and the font still builds successfully.

Written by the indexing model from the issue text.