broadband-modem: fixed wrong MEM1 value passed to +CPMS

In functions

- mm_broadband_modem_lock_sms_storages
- modem_messaging_set_default_storage

return with error when using current_sms_mem1_storage as +CPMS value, but
current_sms_mem1_storage value is UNKNOWN.

src/mm-iface-modem-messaging.c

@@ -789,7 +789,7 @@ set_default_storage_ready (MMIfaceModemMessaging *self,
     GError *error = NULL;
 
     if (!MM_IFACE_MODEM_MESSAGING_GET_INTERFACE (self)->set_default_storage_finish (self, res, &error)) {
-        mm_dbg ("Couldn't set default storage: '%s'", error->message);
+        mm_warn ("Could not set default storage: '%s'", error->message);
         g_error_free (error);
     }