[select] Fix inverted flag in item mouseleave

[atomiks]

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From #2079, it this was incorrectly refactored to !

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commit: 50d3cf6

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Bundle size report

Bundle	Parsed Size	Gzip Size
@base-ui-components/react	▼-1B(0.00%)	▼-1B(0.00%)

Details of bundle changes

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