klipper: Improve "Return to Clipboard" button

Tobias Fellarequested to merge
work/tobias/klipper into master

klipper: Improve "Return to Clipboard" button

  • Make it flat, like the other buttons in the header
  • Don't fill the available width

(The advantages and disadvantages of flat buttons are of course debtable, but generally we're using flat buttons in places like this.)

Before After
image image

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