Allow BroadcastState transition from PAUSING to CANCELED

src/main/java/altk/comm/engine/Broadcast.java

@@ -241,6 +241,7 @@ public abstract class Broadcast
                 BroadcastState.COMPLETED,
                 BroadcastState.ABORTING,
                 BroadcastState.CANCELING, // User action
+                BroadcastState.CANCELED,
                 BroadcastState.PAUSED,
                 BroadcastState.PURGED     // User action
             ));