Allow calling signal-cli without -u flag

For daemon command all local users will be exposed as dbus objects
If only one local user exists, all other commands will use that user,
otherwise a user has to be specified.

src/main/java/org/asamk/signal/commands/GetUserStatusCommand.java

@@ -50,7 +50,7 @@ public class GetUserStatusCommand implements LocalCommand {
             registered = m.areUsersRegistered(new HashSet<>(ns.getList("number")));
         } catch (IOException e) {
             System.err.println("Unable to check if users are registered");
-            return 1;
+            return 3;
         }
 
         // Output