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/ReceiveCommand.java

@@ -141,12 +141,9 @@ public class ReceiveCommand implements ExtendedDbusCommand, LocalCommand {
                     System.out.println();
                 }
             });
-        } catch (UnsatisfiedLinkError e) {
-            System.err.println("Missing native library dependency for dbus service: " + e.getMessage());
-            return 1;
         } catch (DBusException e) {
             e.printStackTrace();
-            return 1;
+            return 2;
         }
         while (true) {
             try {