Add default values when tracking edits in list interface

[azrikahar]

fixes #9538

Context

When we first click block in Markdown custom blocks, it works. But when we try to revert back to inline, nothing seems to happen.

Investigation

The update:model-value for the list form was modified in #8169 here:

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

Lines 215 to 217 in 194862c

	function trackEdits(updatedValues: any) {
	Object.assign(edits.value, updatedValues);
	}

However due to the nature of "if input is the same as the default value", in this case the default is inline, the doesn't end up emitting box: inline here because the unset kicks in:

directus/app/src/components/v-form/form-field.vue

Lines 163 to 173 in 194862c

	function emitValue(value: any) {
	if (
	(isEqual(value, props.initialValue) ||
	(props.initialValue === undefined && isEqual(value, defaultValue.value))) &&
	props.batchMode === false
	) {
	emit('unset', props.field);
	} else {
	emit('update:modelValue', value);
	}
	}

Hence the updatedValues in trackEdits() above never has the property box, so it stays as block.

Fix

Added defaults in case the updatedValues doesn't have specific properties, implying it should "revert" to the default value when we assign it to edits.value.

Also added a line to clear edits value when the drawer is closed.