[Differential] [Request, 2 lines] D1169: update error message deprecated flags

[obogdan (Ovidiu-Florin BOGDAN)]

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REVISION SUMMARY
  the error message was advising to use some deprecated flags. I've updated it to advise to use the current ones.

TEST PLAN
  executed `kdevelop -s inexistant_session_name`

REPOSITORY
  rKDEVELOP KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D1169

AFFECTED FILES
  app/main.cpp

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: obogdan, KDevelop
Cc: kdevelop-devel, KDevelop, arrowdodger