packaging: fix qt.conf for ios tools
packaging: fix qt.conf for ios tools

Qt 5.3.1 does not set the profix only based on the use of QGuiApplication
but actually checks if the app is a bundle, so the Prefix hack in the
qt.conf for the ios tools is not needed anymore.

Task-number: QTCREATORBUG-12393
Change-Id: I6a228d83370bc62929ffd056b9b3051e4562485e
Reviewed-by: Jani Heikkinen <2b9ec7ffaab7704ea5de97a2bb0e3c04e80113f6@digia.com>
Reviewed-by: Kai Koehne <077bc265216106fb22408e62f2d97925ede69d10@digia.com>
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@digia.com>

farseerri/git_code,xianian/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,Distrotech/qtcreator,Distrotech/qtcreator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,maui-packages/qt-creator,xianian/qt-creator,maui-packages/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,martyone/sailfish-qtcreator,Distrotech/qtcreator,farseerri/git_code,danimo/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,Distrotech/qtcreator,farseerri/git_code,xianian/qt-creator,kuba1/qtcreator,maui-packages/qt-creator,kuba1/qtcreator,danimo/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,maui-packages/qt-creator,amyvmiwei/qt-creator,xianian/qt-creator,Distrotech/qtcreator,farseerri/git_code,maui-packages/qt-creator,danimo/qt-creator,danimo/qt-creator,kuba1/qtcreator,danimo/qt-creator,martyone/sailfish-qtcreator,farseerri/git_code,maui-packages/qt-creator,AltarBeastiful/qt-creator,kuba1/qtcreator,AltarBeastiful/qt-creator,danimo/qt-creator,danimo/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,Distrotech/qtcreator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,farseerri/git_code,kuba1/qtcreator,Distrotech/qtcreator,farseerri/git_code,AltarBeastiful/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,xianian/qt-creator,kuba1/qtcreator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,maui-packages/qt-creator,AltarBeastiful/qt-creator,xianian/qt-creator