fix: update key for column resizing preferences

[joelamb]

This is a temporary measure to ensure column width preferences are persisted with a key that can be used to retrieve them. This is only needed until issue#238 is addressed

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a127ffc878b51d44adc616f1a37ce11a8ae3b957

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
ember-headless-table	Patch

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