device: change error code for Reapply() rejecting unsupported flags argument

Changing an error code is an API change. But, so far no flags existed,
so it's unlikely that somebody would send invalid flags or care about
the return code.

src/core/devices/nm-device.c

@@ -13202,7 +13202,7 @@ impl_device_get_applied_connection(NMDBusObject                      *obj,
     if (flags != 0) {
         g_dbus_method_invocation_return_error_literal(invocation,
                                                       NM_DEVICE_ERROR,
-                                                      NM_DEVICE_ERROR_FAILED,
+                                                      NM_DEVICE_ERROR_INVALID_ARGUMENT,
                                                       "Invalid flags specified");
         return;
     }