Log Message:
mate-media: update to 1.22.1

### mate-media 1.22.1

  * Translations update
  * add widget name volume-applet to panel-applet
  * enable/disable StatusIcon applet in XDG dir
  * Allow disabling either statusicon or panelapplet
  * edit desktop file for GtkStatusIcon applet
  * travis: add libmate-panel dependency
  * Re-enable old GtkStatusIcon
  * Enable a mute menuitem for the output
  * Ensure volume slider is always perpendicular to the panel
  * Ensure volume icon is always correctly scaled
  * Convert GtkStatusIcon to real applet