Replace tabs with spaces.

git-svn-id: https://svn.apache.org/repos/asf/maven/skins/trunk@1508605 13f79535-47bb-0310-9956-ffa450edef68
No, this is the Stylus skin.

git-svn-id: https://svn.apache.org/repos/asf/maven/skins/trunk@1508606 13f79535-47bb-0310-9956-ffa450edef68