qmljs: correct slot name for properties starting with “_”
qmljs: correct slot name for properties starting with “_”

Task-number: QTCREATORBUG-12214
Change-Id: Ie8009846ce27d4acbc3e9ad4dd7dda73fde39413
Reviewed-by: Kai Koehne <077bc265216106fb22408e62f2d97925ede69d10@digia.com>

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