State correct slot dependency for vte, as mate-terminal won't build with...

... the old one.

I also have file collisions between gnome- and mate-control-center, and don't know how to fix it from the top of my head. Should I open an issue for this?

The offending files:
   *      /usr/share/applications/window-properties.desktop
   *      /usr/share/applications/keyboard.desktop
   *      /usr/share/applications/display-properties.desktop
   *      /usr/share/applications/at-properties.desktop