selftests/hid: wacom: fix confidence tests

The device is exported with a fuzz of 4, meaning that the `+ t` here
is removed by the fuzz algorithm, making those tests failing.

Not sure why, but when I run this locally it was passing, but not in the
VM of the CI.

Fixes: b0fb904d074e ("HID: wacom: Add additional tests of confidence behavior")
Link: https://gitlab.freedesktop.org/bentiss/hid/-/jobs/53692957#L3315
Acked-by: Jason Gerecke <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Benjamin Tissoires <[e-mail]>

tools/testing/selftests/hid/tests/test_wacom_generic.py

···
         does not overlap with other contacts. The value of `t` may be
         incremented over time to move the point along a linear path.
         """
-        x = 50 + 10 * contact_id + t
-        y = 100 + 100 * contact_id + t
+        x = 50 + 10 * contact_id + t * 11
+        y = 100 + 100 * contact_id + t * 11
         return test_multitouch.Touch(contact_id, x, y)
 
     def make_contacts(self, n, t=0):
···
         tracking_id = contact_ids.tracking_id
         slot_num = contact_ids.slot_num
 
-        x = 50 + 10 * contact_id + t
-        y = 100 + 100 * contact_id + t
+        x = 50 + 10 * contact_id + t * 11
+        y = 100 + 100 * contact_id + t * 11
 
         # If the data isn't supposed to be stored in any slots, there is
         # nothing we can check for in the evdev stream.