fix: use ${package} variable

Author: mattdibi

kura/tools/kura-addon-archetype/src/main/resources/archetype-resources/tests/__package__.test/src/main/java/test/ExampleComponentItTest.java

@@ -10,7 +10,7 @@
  * Contributors:
  *  Eurotech
  *******************************************************************************/
-package org.eclipse.kura.example.test;
+package ${package}.test;
 
 import static org.junit.Assert.assertNotNull;