fix(runtime-core): fix incorrect traverseStaticChildren in prod environment

[linzhe141]

close #11241

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Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	89.4 kB (-3 B)	34.2 kB	30.8 kB (+25 B)
vue.global.prod.js	146 kB (-3 B)	53.6 kB (-3 B)	47.8 kB (+131 B)

Usages

Name	Size	Gzip	Brotli
createApp	51.3 kB (-3 B)	20.1 kB (-1 B)	18.3 kB
createSSRApp	54.7 kB (-3 B)	21.4 kB (-2 B)	19.5 kB (-10 B)
defineCustomElement	53.6 kB (-3 B)	20.9 kB (-1 B)	18.9 kB (-24 B)
overall	65 kB (-3 B)	25.1 kB (+2 B)	22.7 kB (-35 B)

[yyx990803]

Sorry but I don't think this is the right fix.