D25020: fix: create control files only when needed

[Roman Gilg]

romangg created this revision.
romangg added a reviewer: Plasma.
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REVISION SUMMARY
  This way the control directory is only created when a control file becomes
  necessary. In case of default values control files are without information.
  These files are then deleted.

TEST PLAN
  Started Wayland session without writing a file and gets created when control
  needs to be written.

REPOSITORY
  R104 KScreen

BRANCH
  fix-control-write

REVISION DETAIL
  https://phabricator.kde.org/D25020

AFFECTED FILES
  common/control.cpp
  common/control.h

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