Fix reference to 1.13 artifacts

Change-Id: I93890fe66a6973cbbb49d3b9d42265c7ed7a1943
diff --git a/apps/layout/pom.xml b/apps/layout/pom.xml
index a3e4a32..89d780f 100644
--- a/apps/layout/pom.xml
+++ b/apps/layout/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <groupId>org.onosproject</groupId>
         <artifactId>onos-apps</artifactId>
-        <version>1.13.0-SNAPSHOT</version>
+        <version>1.12.1-SNAPSHOT</version>
     </parent>
 
     <artifactId>onos-app-layout</artifactId>