fix regression: reading props.is causes Dynamic component to re-render

[titoBouzout]

Summary

Seems like reading props.is for createElement was causing the Dynamic component to re-render. I've cached it in the same way as the component prop. Introduced by #2514

How did you test this change?

Tested by splicing the fix in the generated code of one of the reproducible bug reports.

Related:
kobaltedev/kobalte#619
https://discord.com/channels/722131463138705510/1404584263755759707
https://discord.gg/solidjs

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[coveralls]

Pull Request Test Coverage Report for Build 16902016019

Details

• 16 of 16 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.8%) to 86.017%

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Files with Coverage Reduction	New Missed Lines	%
packages/solid/src/reactive/scheduler.ts	1	81.08%

Totals
Change from base Build 16791160984:	0.8%
Covered Lines:	2365
Relevant Lines:	2679

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💛 - Coveralls