ivi-shell: SEGV occurs when multi touch happens in transition

of application launching. This is because cancel callback is mistakenly
set to weston_touch_grab_interface. To fix this issue, add a
callback, touch_move_workspace_grab_frame and set it to the
weston_touch_grab_interface like desktop-shell.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>