fix(CurveEditor): error when copy/pasting eases

[tomorrowevening]

Fixes the bug when a user copies the easing preset and tries pasting it somewhere else:

Uncaught TypeError: Cannot read properties of undefined (reading 'target') at onInputChange (CurveEditorPopover.tsx:178:21)

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Name	Status	Preview	Comments	Updated (UTC)
theatre-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2023 11:16am

[AriaMinaei]

Thanks @tomorrowevening!