D23986: [plugins/scenes/opengl] Use linear filter on Wayland

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REVISION SUMMARY
  With nearest filter fractional scaling is blurry, always use linear filter
  instead on Wayland.

TEST PLAN
  Run Plasma session with patch and scale factor 1.9.

REPOSITORY
  R108 KWin

BRANCH
  linearScaling

REVISION DETAIL
  https://phabricator.kde.org/D23986

AFFECTED FILES
  plugins/scenes/opengl/scene_opengl.cpp

To: romangg, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, mart