LibWeb: Some fixes for failing WPT geometry tests

[tcl3]

This PR fixes issues exposed by some WPT geometry tests

Before: DOMMatrix-001 - crashed WebContent DOMMatrix-invert-preserves-2d - 1 fail DOMPoint-002 - 1 fail DOMQuad-001 - 1 fail DOMQuad-nan - 6 fail DOMRect-nan - 4 fail structured-serialization - 30 fail

After: DOMMatrix-001 - 12 fail DOMMatrix-invert-preserves-2d - 1 fail structured-serialization - 30 fail