ikea_e2001_e2002: handle "unknown" state

[beardhatcode]

Since the update to HA2024.10, the state of my zigbee2mqqt linked Stybar becomes "unknown" instead of "None"

UI of stybar before the update:

• changed to None 00:24:55 - 23 hours ago
• changed to arrow_right_click 00:24:55 - 23 hours ago
• changed to None 00:24:55 - 23 hours ago

now the same event looks like:

• became unknown 23:52:22 - 3 minutes ago
• changed to arrow_right_click 23:52:22 - 3 minutes ago
• became unknown 23:52:21 - 3 minutes ago

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Proposed change*

Since the update to HA2024.10 my stybar left and right clicks did not work anymore. As noted above the intermediate state changed. This edit deals with that.

Checklist*

• I followed sections of the Contribution Guidelines relevant to changes I'm proposing.
• I properly tested proposed changes on my system and confirm that they are working as expected.
• I formatted files with Prettier using the command npm run format before submitting my Pull Request.

[github-actions]

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