sms-mbim: fix peek_device to use g_task_report_new_error

When porting MMSmsMbim to use GTask, peek_device wasn't modified to use
g_task_report_new_error, which could potentially lead to an incorrect
G_TASK cast.

src/mm-sms-mbim.c

@@ -53,9 +53,10 @@ peek_device (gpointer self,
 
         port = mm_base_modem_peek_port_mbim (modem);
         if (!port) {
-            g_simple_async_report_error_in_idle (G_OBJECT (self),
+            g_task_report_new_error (self,
                                      callback,
                                      user_data,
+                                     peek_device,
                                      MM_CORE_ERROR,
                                      MM_CORE_ERROR_FAILED,
                                      "Couldn't peek MBIM port");