ordinal: fix suffix for negative numbers

[simpleqt]

Summary

ordinal indexes its suffix tables with value % 10 (and the 11/12/13 special case with value % 100), but Python's modulo maps negative numbers outside those ranges — -1 % 10 == 9 — so every negative number gets the generic th suffix:

>>> from humanize import ordinal
>>> ordinal(-1)
'-1th'        # expected '-1st'
>>> ordinal(-3)
'-3th'        # expected '-3rd'
>>> ordinal(-101)
'-101th'      # expected '-101st'

The fix selects the suffix on the absolute value, so negative ordinals get the same suffix as their positive counterparts while keeping the sign in the output.

Verification

• Red/green: added -1/-2/-3/-4/-11/-111/-101 params to test_ordinal; 4 of them fail on master ('-3th' == '-3rd' etc.) and all pass with this change.
• Full file: pytest tests/test_number.py → 108 passed, no regressions.

AI Disclosure

This PR was prepared with the assistance of an AI coding agent.

• Tool(s): ZCode (GLM-based coding agent)
• Used for: discovering the negative-modulo indexing bug via a display-format sweep, implementing the absolute-value selection, and running the red/green and full-file verification described above.

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[hugovk]

Wrong repo, but a duplicate of many others.