[patch] Fix network monitor colors and stacking

[Sergey]

  As suggested in http://bugs.kde.org/show_bug.cgi?id=237922 I'm
sending a patch here as well.

Problem:
  It's very hard to understand on the network monitor plasmoid which
  line is download and which is upload speed. They also stack and
  this is not really usual for this kind of graphs.

Solution:
  Change colors and make graphs not stacked.

Attached patch implements it.

-- 
  Sergey
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