D23948: Don't initialize QFlags<T> with 0 value

zzag created this revision.
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REVISION SUMMARY
  clang-tidy has a check that converts all usages of null pointer literals
  to nullptr keyword. However, there's a small issue related to QFlags<T>.
  
  Apparently, QFlags<T> has a constructor that takes a pointer and if you
  pass 0 to it, clang-tidy will replace 0 with nullptr, e.g.
  
    NET::States(0) -> NET::States(nullptr)
  
  Even though passing nullptr is totally correct, it looks very weird.

TEST PLAN
  Complies.

REPOSITORY
  R108 KWin

BRANCH
  default-initialization-qflags

REVISION DETAIL
  https://phabricator.kde.org/D23948

AFFECTED FILES
  abstract_client.cpp
  client.cpp
  geometry.cpp

To: zzag, #kwin
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