Console: Show offline expiration on LS debug page

core/java/src/net/i2p/data/LeaseSet2.java

@@ -252,6 +252,15 @@ public class LeaseSet2 extends LeaseSet {
         return _transientSigningPublicKey;
     }
 
+    /**
+     *  Absolute time, not time from now.
+     *  @return transient expiration time or 0 if not offline signed
+     *  @since 0.9.48
+     */
+    public long getTransientExpiration() {
+        return _transientExpires;
+    }
+
     /**
      *  Destination must be previously set.
      *