D27496: Fix isImmutable generated property

[Cyril Rossi]

crossi accepted this revision.

REPOSITORY
  R237 KConfig

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D27496

To: meven, hchain, ervin, bport, crossi, #frameworks
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns