fix(kmultiselect): autofocus on input upon opening [KHCP-12491]

[portikM]

Summary

Addresses: https://konghq.atlassian.net/browse/KHCP-12491

Fix autofocus on input in KMultiselect dropdown upon opening

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[kongponents-bot]

:tada: This PR is included in version 9.0.7 :tada:

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