fix(useTemplateRef): don't update setup ref for useTemplateRef key

[edison1105]

close #12749

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+77 B)	38 kB (+32 B)	34.2 kB (-8 B)
vue.global.prod.js	158 kB (+77 B)	57.9 kB (+28 B)	51.5 kB (+30 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.5 kB (+77 B)	18.2 kB (+33 B)	16.7 kB (+20 B)
createApp	54.4 kB (+77 B)	21.2 kB (+32 B)	19.4 kB (+38 B)
createSSRApp	58.6 kB (+77 B)	22.9 kB (+28 B)	20.9 kB (+28 B)
defineCustomElement	59.2 kB (+77 B)	22.8 kB (+35 B)	20.7 kB (+27 B)
overall	68.4 kB (+77 B)	26.4 kB (+28 B)	24 kB (-13 B)

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@vue/compiler-core

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@vue/reactivity

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vue

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@vue/compat

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commit: e4208e4

[jh-leong]

It seems this change might break an existing case: Playground