fix(custom-element): properly resolve props for sync component defs

[edison1105]

close #12854

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (-58 B)	38.1 kB (-14 B)	34.3 kB (+19 B)
vue.global.prod.js	158 kB (-58 B)	58 kB (-11 B)	51.6 kB (-75 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.5 kB	18.2 kB	16.7 kB
createApp	54.6 kB	21.3 kB	19.4 kB
createSSRApp	58.8 kB	23 kB	21 kB
defineCustomElement	59.3 kB (-58 B)	22.9 kB (-16 B)	20.8 kB (-21 B)
overall	68.6 kB	26.4 kB	24 kB

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commit: bf5cca9

[edison1105]

the following code will overwrite the props value

core/packages/runtime-dom/src/apiCustomElement.ts

Lines 343 to 345 in 9611513

	for (let i = 0; i < this.attributes.length; i++) {
	this._setAttr(this.attributes[i].name)
	}

so it should be resolved in the connectedCallback