KAcceleratorManager does not automanage some popups

[Albert Astals Cid]

It is failing both in 3.5 and 4.0 branch on RMB popup menu of kpdf/okular 
(possibly on other places too)

The attached patch fixes the problem for me, but i have to admit i don't have 
much Accelerator-foo so reviews are VERY welcome.

Any objections in committing it to both 3.5 and 4.0 branch?

Albert
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