(fix) - Set value/checked on custom-elements

[JoviDeCroock]

When we are dealing with custom-elements setting it on the node itself isn't sufficient we have to ensure it is propagated through.

I'll ask the OP if this resolves the issue, since I'm not entirely sure

Fixes: #2464

[github-actions]

Size Change: -37 B (0%)

Total Size: 39 kB

Filename	Size	Change
dist/preact.js	3.8 kB	-9 B (0%)
dist/preact.min.js	3.8 kB	-9 B (0%)
dist/preact.module.js	3.81 kB	-9 B (0%)
dist/preact.umd.js	3.86 kB	-10 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
compat/dist/compat.js	3.12 kB	0 B
compat/dist/compat.module.js	3.14 kB	0 B
compat/dist/compat.umd.js	3.17 kB	0 B
debug/dist/debug.js	3 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	175 B	0 B
devtools/dist/devtools.module.js	185 B	0 B
devtools/dist/devtools.umd.js	252 B	0 B
hooks/dist/hooks.js	1.05 kB	0 B
hooks/dist/hooks.module.js	1.08 kB	0 B
hooks/dist/hooks.umd.js	1.12 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}

[github-actions]

Coverage remained the same at 99.8% when pulling 00f85d3 on support-value-checked-custom-elements into b69fc97 on master.

[marvinhagemeister]

Sweet 🎉