D15949: [effects/zoom] Set wrap mode for cursor texture

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REVISION SUMMARY
  With the Oxygen cursor theme, a visual glitch can appear in the
  bottom-left corner of the cursor when the screen is zoomed in.
  
  The reason for that is we're using GL_REPEAT for GL_TEXTURE_WRAP_S
  and GL_TEXTURE_WRAP_T. So, when the linear filter samples neighboring
  texels in the bottom, it can sample some texels from the top (because of
  GL_REPEAT).
  
  To fix that, we have to set the wrap mode to GL_CLAMP_TO_EDGE.
  
  BUG: 338254
  FIXED-IN: 5.14.0

TEST PLAN
  Before:
  F6303912: Screenshot_20181004_202025.png <https://phabricator.kde.org/F6303912>
  
  After:
  F6303913: Screenshot_20181004_201911.png <https://phabricator.kde.org/F6303913>
  
  Tried other cursor themes(Breeze and Adwaita), everything looks okay.

REPOSITORY
  R108 KWin

BRANCH
  Plasma/5.14

REVISION DETAIL
  https://phabricator.kde.org/D15949

AFFECTED FILES
  effects/zoom/zoom.cpp

To: zzag, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart