D18592: [wayland] Call ShellClient install interface methods consistently

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REVISION SUMMARY
  When we create a new Shellclient there may be a pending relevant
  interface.
  
  For every other case this is handled in WaylandServer, the class
  responsible for attaching new interfaces at runtime.
  The only exception is ServerSideDecorationInterface which is handled in
  the ShellClient constructor.
  
  This makes everything consistent.
  
  No behavioural changes.

TEST PLAN
  Ran unit tests

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18592

AFFECTED FILES
  shell_client.cpp
  wayland_server.cpp

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