evdev: always store user calibration matrix

evdev: always store user calibration matrix

In evdev_device_calibrate, the user matrix was not being stored when it
was the identity matrix. This resulted in
libinput_device_config_calibration_get_matrix not providing the correct
matrix. Instead of giving the identity matrix, the last non-identity
matrix set was given.

This just moves the storage of the user matrix in
evdev_device_calibrate to be above the identity matrix early return so
that it always get stored.

Signed-off-by: Brian Ashworth <bosrsf04@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>