fix: use modifying word in error message

[ggnmstr]

No description provided.

[Copilot]

Pull request overview

This PR corrects a misspelling in the error message emitted when DuckDB-backed execution encounters a modifying statement targeting a Postgres table, and updates the corresponding test assertion to match.

Changes:

• Fix typo in elog error message: “modififying” → “modifying”.
• Update pytest.raises(..., match=...) expectation to the corrected wording.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/pycheck/copy_test.py	Updates regex match string to the corrected error message text.
src/pgduckdb_hooks.cpp	Fixes the misspelled word in the emitted error message.

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