D18153: Correct code style of Client fullscreen control

romangg created this revision.
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REVISION SUMMARY
  As a preperational step for future changes obey the code
  styling guide in Client fullscreen functionality.

TEST PLAN
  Manually, autotests pass.

REPOSITORY
  R108 KWin

BRANCH
  clientFullscreenCodingStyle

REVISION DETAIL
  https://phabricator.kde.org/D18153

AFFECTED FILES
  client.cpp
  client.h
  events.cpp
  geometry.cpp
  manage.cpp

To: romangg, #kwin
Cc: kwin, kvanton, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart