fix: DynamicScroller should pass its own keyField prop to child RecycleScroller

[nicooprat]

When using DynamicScroller, the keyField prop was ignored because it was manually set as its default value id here.

[ryanpwaldon]

Might need to bind the attribute for this one to work 😜

[ryanpwaldon]

That was fast. Not banking on a merge anytime soon tho 😆🤞

[Akryum]

I merged this PR too fast, it is expected that DynamicScroller hard code key-field to id.

I will revert this to fix #758

[Akryum]

Items passed from DynamicScroller to RecycleScroller are always of the shape { id, item, size }:

vue-virtual-scroller/packages/vue-virtual-scroller/src/components/DynamicScroller.vue

Lines 115 to 125 in 95b934a

	const item = items[i]
	const id = simpleArray ? i : item[keyField]
	let size = sizes[id]
	if (typeof size === 'undefined' && !this.$_undefinedMap[id]) {
	size = 0
	}
	result.push({
	item,
	id,
	size,
	})

[leochen-g]

This issue has resurfaced in version 2.0, perhaps requiring another round of fixes.