Consider simplifying setting of query from Slicer

[jcfr]

from @subdavis

Instead of maintaining external api app.search, consider updating the location within slicer by specifying q parameter

See

slicer-extensions-webapp/src/main.ts

Lines 29 to 34 in 65d703e

	search(q: string) {
	/* See https://github.com/vuejs/vetur/issues/1754#issuecomment-595256501 */
	/* eslint-disable @typescript-eslint/no-explicit-any */
	const view = this.$root.$children[0].$refs.view as any;
	view.query = q;
	},