fix(compat): don't leak class prop when using className

[wardpeet]

When using preact-compat with className it leaks the class prop into a react component and breaks spreading props.

I might be missing some context here so this fix might not be 100% accurate.

Fixes #2582

[github-actions[bot]]

Size Change: +78 B (0%)

Total Size: 39.8 kB

Filename	Size	Change
compat/dist/compat.js	3.23 kB	+27 B (0%)
compat/dist/compat.module.js	3.25 kB	+24 B (0%)
compat/dist/compat.umd.js	3.28 kB	+27 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
debug/dist/debug.js	2.99 kB	0 B
debug/dist/debug.module.js	2.98 kB	0 B
debug/dist/debug.umd.js	3.08 kB	0 B
devtools/dist/devtools.js	184 B	0 B
devtools/dist/devtools.module.js	195 B	0 B
devtools/dist/devtools.umd.js	260 B	0 B
dist/preact.js	3.88 kB	0 B
dist/preact.min.js	3.88 kB	0 B
dist/preact.module.js	3.89 kB	0 B
dist/preact.umd.js	3.93 kB	0 B
hooks/dist/hooks.js	1.09 kB	0 B
hooks/dist/hooks.module.js	1.11 kB	0 B
hooks/dist/hooks.umd.js	1.17 kB	0 B
test-utils/dist/testUtils.js	437 B	0 B
test-utils/dist/testUtils.module.js	439 B	0 B
test-utils/dist/testUtils.umd.js	515 B	0 B

_{compressed-size-action}

[marvinhagemeister]

Good catch! I think we just need a check around the normalization code that verifies that the current vnode is a component :+1:

[wardpeet]

I could lower the bytes by using a function for the descriptor but gzip & brotli wise it would be bigger. Unsure what we optimize for here.