Remove superflous sling.java.version=6 as it's the default now

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1687505 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index bb0db34..b41d6f8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -42,10 +42,6 @@
     <url>http://svn.apache.org/viewvc/sling/trunk/bundles/scripting/api</url>
   </scm>
 
-  <properties>
-    <sling.java.version>6</sling.java.version>
-  </properties>
-
   <build>
     <plugins>
       <plugin>