device,plugin: reset MMDevice's hotplugged after creating the modem

The hotplugged flag was added to simplify modem probe on first time it
is created. Before the re-probe it must be set to FALSE to destroy all
existing netlink interfaces and force full reconfiguration.

src/mm-plugin.c

@@ -962,6 +962,8 @@ mm_plugin_create_modem (MMPlugin  *self,
         return NULL;
 
     mm_base_modem_set_hotplugged (modem, mm_device_get_hotplugged (device));
+    /* Reset hotplugged flag to guarantee full reconfiguration on next probe */
+    mm_device_reset_hotplugged (device);
 
     if (port_probes) {
         GList *l;