Tslib QWS: also apply missing release coordinate code to non-raw mode

Even if the normal mode is used the release events may have zero coordinates.

Change-Id: Ia9de05928ab5dfc225665e3b2c9a4d42f6ba984e
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Tslib plugin: also apply missing release coordinate code to non-raw mode

Even if the normal mode is used the release events may have zero coordinates.

Change-Id: I2eac8cf50dfcf9e62d8cec2423419a6579266849
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
(cherry picked from qtbase/9ba7cc07dbef542bc73f97f1d7458699d25fbb8d)