fix(runtime-vapor): current instance is not attached to static slots

[LittleSound]

related #168

When all slots are static slots, it is also necessary to call withCtx to attach the current instance to the slots.

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Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	81.2 kB	28.5 kB	25.1 kB
compiler-vapor.global.prod.js	57.6 kB	19.6 kB	17.7 kB
runtime-dom.global.prod.js	95.4 kB	36 kB	32.4 kB
runtime-vapor.global.prod.js	48.9 kB (+39 B)	18.3 kB (+16 B)	16.7 kB (+14 B)
vue-vapor.global.prod.js	104 kB (+39 B)	36.3 kB (+18 B)	32.7 kB (+23 B)
vue.global.prod.js	154 kB	55.6 kB	49.7 kB

Usages

Name	Size	Gzip	Brotli
createApp	55.8 kB	21.4 kB	19.5 kB
createSSRApp	59.1 kB	22.7 kB	20.7 kB
defineCustomElement	58.1 kB	22.1 kB	20.1 kB
vapor	49.3 kB (+39 B)	18.3 kB (+15 B)	16.7 kB (+13 B)
overall	69.6 kB	26.4 kB	23.9 kB