Task Macro does not work if only installed in sub wiki

[ClemensRobbenhaar]

Steps to reproduce:

• Install the app only in a subwiki
• create a new page and add a task
• in view mode view the page and click on the checkbox

Result:
URL: http://localhost:8080/xwiki/rest/wikis//spaces/testpage/pages/Task_1/task?status=Done returns a 404

Likely fix:
Add a <xwiki.extension.namespaces>{root}</xwiki.extension.namespaces> in the <properties> part of the pom.xml of the componend defining the REST-API endpoint.