D5563: Safe Browsing configuration: improve wording, remove redundant GroupBox

[Elias Probst]

eliasp added a reviewer: mlaurent.

REPOSITORY
  R201 Akregator

REVISION DETAIL
  https://phabricator.kde.org/D5563

To: eliasp, mlaurent
Cc: #kde_pim, dvasin, ach, winterz, vkrause, mlaurent, knauss, dvratil
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