Fix session count properties

bug: 21787354

merge of http://go/wvgerrit/14663 from the widevine repo

Change-Id: Ia8618c9daba2526234c5c5c84590e74d6feebf95

libwvdrmengine/test/java/src/com/widevine/test/MediaDrmAPITest.java

@@ -285,6 +285,7 @@ public class MediaDrmAPITest extends Activity {
         // widevine-specific properties
         displayText("security level: " + drm.getPropertyString("securityLevel"));
         displayText("system ID: " + drm.getPropertyString("systemId"));
+        displayText("max sessions: " + drm.getPropertyString("maxNumberOfSessions"));
         stopDrm(drm);
     }