xfce4-screenshooter: update to 1.9.4

=== Version 1.9.4 ===
  * Enhancements:
    - Extended save function to also take files (bug #14156, thanks to Arthur Jansen)
    - Show width and height of selection area (bug #12664, thanks to Simon)
    - Improved imgur dialog (bug #14973, thanks to Arthur Jansen)
    - Don't save region/delay/show_mouse if region was specified from CLI

  * Bugs fixed:
    - React to core X input events when XInput is not available (bug #15166)
    - Fix crash and properly handle cursors on HiDPI (thanks to Viktor Odintsev)
    - Delay in panel plugin does not work (bug #14604)

(gutteridge)