Center "Kill process/application" dialog in window, not view

Nate Grahamrequested to merge
work/ngraham/center-kill-popup into master

When it's centered on the view, there may not be enough room to fit all the buttons if the user makes the window small when usign a language with long words, like Russian.

Before After
Before After

BUG: 506653 FIXED-IN: 6.4.5

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