D13599: Ref KConfig whilst we're using it

[David Edmundson]

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REVISION SUMMARY
  In current code we would have a KConfigGroup with a dangling KConfig
  deleted after the RHS for the group fetch has finished.
  
  BUG: 394534

TEST PLAN
  Wrote minimal test case of code
  It produced a valgrind warning (weirdly didn't crash though)
  Modified to correct version
  No longer any warnings

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.13

REVISION DETAIL
  https://phabricator.kde.org/D13599

AFFECTED FILES
  kcms/mouse/backends/x11/x11_backend.cpp

To: davidedmundson, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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