fix: fix & simplify keyword removal #959

Job	Run time
ash-ci / mix deps.get	22s
ash-ci / audit	47s
ash-ci / mix igniter.upgrade	0s
ash-ci / MIX_ENV=test mix.compile	24s
ash-ci / mix docs	55s
ash-ci / MIX_ENV=dev mix.compile	30s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix credo --strict	3s
ash-ci / mix dialyzer	2m 25s
ash-ci / mix format --check-formatted	23s
ash-ci / mix sobelow	6s
ash-ci / mix spark.cheat_sheets --check	4s
ash-ci / mix spark.formatter --check	4s
ash-ci / mix test	2m 0s
ash-ci / mix deps.unlock --check-unused	22s
ash-ci / Deploy docs to GitHub pages.	8s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
	8m 33s

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