Pointer.press uses the removed ._x and ._y properties

[Leo Arias]

In http://bazaar.launchpad.net/~autopilot/autopilot/trunk/revision/546/autopilot/input/__init__.py, I moved the x and y properties to the backend, removing them from the Pointer class.

I didn't update the press method, so now it is using unexisting properties.

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/address_book_app/tests/test_delete_contact.py", line 68, in test_select
    list_page.select_contacts(indices)
  File "/usr/lib/python3/dist-packages/autopilot/logging.py", line 46, in inner
    return f(instance, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/address_book_app/pages/_contact_list_page.py", line 77, in select_contacts
    self._start_selection(indices[0])
  File "/usr/lib/python3/dist-packages/address_book_app/pages/_contact_list_page.py", line 102, in _start_selection
    self.pointing_device.press()
  File "/usr/lib/python3/dist-packages/autopilot/input/__init__.py", line 596, in press
    self._device.press(self._x, self._y)
AttributeError: 'Pointer' object has no attribute '_x'

[PS Jenkins bot (ps-jenkins)]

Fix committed into lp:autopilot at revision 548, scheduled for release in autopilot, milestone 1.4