Fix repeater interface template

[azrikahar]

fixes #9587

Context

Previously the logic was "return either props.template or first field":

directus/app/src/interfaces/list/list.vue

Line 134 in 7eb2cb1

const templateWithDefaults = computed(() => props.template || `{{${props.fields[0].field}}}`);

However the current logic is props.template became a condition check in #9113:

directus/app/src/interfaces/list/list.vue

Lines 134 to 136 in 057af23

	const templateWithDefaults = computed(() =>
	props.template || props.fields?.[0]?.field ? `{{${props.fields[0].field}}}` : ''
	);

So we'll need to move props.template back into the if statement body.