D26181: [KCM/Component] Clean deprecated code, modernize code

[Méven Car]

meven created this revision.
meven added reviewers: ervin, Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
meven requested review of this revision.

TEST PLAN
  No changes

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D26181

AFFECTED FILES
  kcms/componentchooser/componentchooser.cpp

To: meven, ervin, #plasma
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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