D9808: fix incorrect emission of signals by kLineEdit

[Anthony Fieroni]

anthonyfieroni added reviewers: dhaumann, cullmann.

REPOSITORY
  R284 KCompletion

REVISION DETAIL
  https://phabricator.kde.org/D9808

To: dweatherill, #frameworks, dhaumann, cullmann
Cc: anthonyfieroni, iodelay, vbspam, njensen, geetamc, Pilzschaf, akshaydeo, surgenight, arrowdodger
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