authentication:passcodemanager: long literal '0l' should be 0L.

The suffix L is preferred, because the letter l (ell) is often hard to distinguish from the digit 1 (one).

src/main/java/com/owncloud/android/authentication/PassCodeManager.java

@@ -52,7 +52,7 @@ public class PassCodeManager {
 
     private static PassCodeManager passCodeManagerInstance = null;
 
-    private Long timestamp = 0l;
+    private Long timestamp = 0L;
     private int visibleActivitiesCounter = 0;
 
     public static PassCodeManager getPassCodeManager() {