Fix usages of undefined variable onos.version

Change-Id: Id3e90ef3d589d195211800fed41f167621e0b63c
diff --git a/apps/packet-stats/app/pom.xml b/apps/packet-stats/app/pom.xml
index fe5b535..1212819 100644
--- a/apps/packet-stats/app/pom.xml
+++ b/apps/packet-stats/app/pom.xml
@@ -44,7 +44,7 @@
         <dependency>
             <groupId>org.onosproject</groupId>
             <artifactId>onos-incubator-api</artifactId>
-            <version>${onos.version}</version>
+            <version>${project.version}</version>
         </dependency>
         <dependency>
             <groupId>org.onosproject</groupId>