Wiki autocoloring does not work with negative numbers

[Fayti1703]

Repro Steps

1. Create a page with the text (( \{ works: 1, fails: -1 \} )).
2. Render it

Note

The page on #db.f(..).sort() currently has text of this form.

Expected: Both keys are N-colored, both values are V-colored

Actual: Only the non-negative key is colored

Impact

This is inconsistent with the game client's autocoloring and looks quite odd.