auto-t: fix FT over DS test to wait for connected

Due to timing this test sometimes does not pass because it was
just asserting on the device state rather than waiting for a
change. This generally worked but not always.

autotests/testFT-PSK-over-DS/connection_test.py

@@ -88,7 +88,9 @@ class Test(unittest.TestCase):
         condition = 'obj.state != DeviceState.roaming'
         wd.wait_for_object_condition(device, condition)
 
-        self.assertEqual(device.state, iwd.DeviceState.connected)
+        condition = 'obj.state == DeviceState.connected'
+        wd.wait_for_object_condition(device, condition)
+
         self.assertTrue(self.bss_hostapd[1].list_sta())
 
         testutil.test_iface_operstate(device.name)