Remove unused import from template (helidon-io#2048)

Signed-off-by: tim.quinn@oracle.com <tim.quinn@oracle.com>

Author: tjquinno

archetypes/bare-se/src/main/resources/src/main/java/__pkg__/Main.java.mustache

@@ -11,7 +11,6 @@ import io.helidon.health.checks.HealthChecks;
 import io.helidon.media.jsonp.JsonpSupport;
 import io.helidon.metrics.MetricsSupport;
 import io.helidon.webserver.Routing;
-import io.helidon.webserver.ServerConfiguration;
 import io.helidon.webserver.WebServer;
 
 /**