remove unneeded map-id="DEMO_MAP_ID"

Author: chrisjshull

samples/web-components-map/index.njk

@@ -6,6 +6,6 @@
 -->
 {% extends '../../src/_includes/layout.njk'%} {% block html %}
 <!-- [START maps_web_components_map_gmpmap] -->
-<gmp-map center="37.4220656,-122.0840897" zoom="10" map-id="DEMO_MAP_ID" style="height: 400px"></gmp-map>
+<gmp-map center="37.4220656,-122.0840897" zoom="10" style="height: 400px"></gmp-map>
 <!-- [END maps_web_components_map_gmpmap] -->
 {% endblock %}