Reverted "[Activities KCM] vertically center the buttons"

[David Edmundson]

git branch --contains 9cdfe25910cbbfbef09364ce3adba5
  Plasma/5.12
  Plasma/5.14
  Plasma/5.15
* master

git branch --contains ccc6e24f9aab3da40f0ff2ba7b505022b485ed0e
(your revert)
  master

Can you double check everything's ok everywhere.

David
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