fix: "steamer that" no longer flagged as typo

[hippietrail]

Issues

Fixes #3902

Description

"that steamer" was flagged as a typo for "than steamer".
This was due to a leftover artefact of the Hunspell origin of Harper's dictionary.
In Hunspell a single annotation flag added "-er" to words.
In Harper, this annotation was extended to assign a "comparative" property to resulting words when the base word included an adjective annotation. Most dictionaries don't include an adjective sense for "steam" but Collins and Wiktionary do.
Efforts were made to remove any of those which were not on adjectives but it was difficult to automate so some words slipped through.

The annotation flag, now > was simply removed as we already had a separate entry for "steamer" that was correctly annotated.

How Has This Been Tested?

Added the sentence from the bug report as a new test and verified that just test still passes.

AI Disclosure

• I am a human and didn't use any AI.
• I used LLM features of my editor, but not an agent.
• I used an AI agent interactively.
• I am an agent or I got an agent to do the work autonomously.

If Your PR Implements or Enhances a Linter

• I made up the sentences in the unit tests.
• The sentences in the unit tests were generated by an AI.
• I'm using examples from the bug report / feature request.
• I collected real-world sentences for the unit tests.

Checklist

• I have performed a self-review of my own code
• I have added tests to cover my changes
• I have considered splitting this into smaller pull requests.