mate-netbook: update to mate-netbook 1.22.2

Change log:

mate-netbook 1.22.2

    tx: sync with transifex
    Use the same variable name for return value than elsewhere
    Remove cppcheck warnings with better variables scope
    Remove unused variable declaration in applet.c and task-list.c
    Add an option to disable the bold face of the window title in applet
    Make the 'show-home-title' feature work again
    Fix several compilation warnings
    Refactor the on_active_window_changed function
    Remove a runtime error due to event->time sending buggy values
    Change preference label for the window picker applet, and add a tooltip
    Cleanup whitespaces

(gutteridge)