Normalize onDoubleClickCapture to a real dblclick listener

[contactjawad]

onDoubleClick is normalized to dblclick in compat, but the capture variant isn't:

<div onDoubleClickCapture={fn} />

The check is an exact === 'ondoubleclick', so onDoubleClickCapture slips past it. Core then strips the Capture suffix and registers a listener for doubleclick with capture — an event the DOM never fires — so fn never runs.

I added the capture branch next to the existing one so it maps to ondblclickCapture, and core ends up with addEventListener('dblclick', fn, true). Test added alongside the existing onDoubleClick one.

[github-actions]

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