D12986: [Trash KCM] Clean up and standardize UI to be in line with the KDE HIG

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: Dolphin, Frameworks, VDG.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: kde-frameworks-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  Clean up and standardize the UI to be in line with the KDE HIG.

TEST PLAN
  - All functionality still works
  - Checking and unchecking the checkboxes still enables and disables companion items appropriately
  - No unit test regressions, and trash test still passes
  - Visual comparison:
  
  Before:
  
  After:

REPOSITORY
  R241 KIO

BRANCH
  clean-up-trash-kcm (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D12986

AFFECTED FILES
  src/ioslaves/trash/kcmtrash.cpp

To: ngraham, #dolphin, #frameworks, #vdg
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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