[fix] Silence unknown prop warnings coming from SvelteKit

[dummdidumm]

This is a hack, but it's a working quick solution. Fixes #5980

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[benperiton]

If I have a named layout, this still pops up as:

<Layout_auth> was created with unknown prop 'data'
<Page_auth> was created with unknown prop 'data'

Think the regex just needs a little tweak