debugger: fix enabled state of 'start external'
debugger: fix enabled state of 'start external'

Reviewed-by: Friedemann Kleint

danimo/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,azat/qtcreator,KDAB/KDAB-Creator,amyvmiwei/qt-creator,syntheticpp/qt-creator,maui-packages/qt-creator,Distrotech/qtcreator,KDE/android-qt-creator,colede/qtcreator,syntheticpp/qt-creator,azat/qtcreator,bakaiadam/collaborative_qt_creator,danimo/qt-creator,xianian/qt-creator,richardmg/qtcreator,hdweiss/qt-creator-visualizer,pcacjr/qt-creator,farseerri/git_code,ostash/qt-creator-i18n-uk,kuba1/qtcreator,dmik/qt-creator-os2,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,kuba1/qtcreator,richardmg/qtcreator,darksylinc/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,duythanhphan/qt-creator,AltarBeastiful/qt-creator,farseerri/git_code,darksylinc/qt-creator,colede/qtcreator,danimo/qt-creator,yinyunqiao/qtcreator,yinyunqiao/qtcreator,syntheticpp/qt-creator,yinyunqiao/qtcreator,xianian/qt-creator,Distrotech/qtcreator,dmik/qt-creator-os2,danimo/qt-creator,syntheticpp/qt-creator,martyone/sailfish-qtcreator,dmik/qt-creator-os2,KDAB/KDAB-Creator,KDAB/KDAB-Creator,AltarBeastiful/qt-creator,KDAB/KDAB-Creator,yinyunqiao/qtcreator,dmik/qt-creator-os2,KDE/android-qt-creator,malikcjm/qtcreator,farseerri/git_code,colede/qtcreator,kuba1/qtcreator,omniacreator/qtcreator,xianian/qt-creator,kuba1/qtcreator,maui-packages/qt-creator,malikcjm/qtcreator,AltarBeastiful/qt-creator,Distrotech/qtcreator,jonnor/qt-creator,malikcjm/qtcreator,syntheticpp/qt-creator,azat/qtcreator,xianian/qt-creator,kuba1/qtcreator,duythanhphan/qt-creator,omniacreator/qtcreator,martyone/sailfish-qtcreator,ostash/qt-creator-i18n-uk,richardmg/qtcreator,bakaiadam/collaborative_qt_creator,duythanhphan/qt-creator,sandsmark/qtcreator-minimap,renatofilho/QtCreator,xianian/qt-creator,KDAB/KDAB-Creator,darksylinc/qt-creator,xianian/qt-creator,syntheticpp/qt-creator,jonnor/qt-creator,syntheticpp/qt-creator,richardmg/qtcreator,azat/qtcreator,jonnor/qt-creator,pcacjr/qt-creator,colede/qtcreator,danimo/qt-creator,omniacreator/qtcreator,maui-packages/qt-creator,martyone/sailfish-qtcreator,renatofilho/QtCreator,jonnor/qt-creator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,renatofilho/QtCreator,danimo/qt-creator,bakaiadam/collaborative_qt_creator,maui-packages/qt-creator,pcacjr/qt-creator,hdweiss/qt-creator-visualizer,darksylinc/qt-creator,sandsmark/qtcreator-minimap,malikcjm/qtcreator,ostash/qt-creator-i18n-uk,bakaiadam/collaborative_qt_creator,yinyunqiao/qtcreator,colede/qtcreator,martyone/sailfish-qtcreator,jonnor/qt-creator,dmik/qt-creator-os2,hdweiss/qt-creator-visualizer,KDE/android-qt-creator,dmik/qt-creator-os2,malikcjm/qtcreator,sandsmark/qtcreator-minimap,kuba1/qtcreator,richardmg/qtcreator,darksylinc/qt-creator,malikcjm/qtcreator,hdweiss/qt-creator-visualizer,duythanhphan/qt-creator,darksylinc/qt-creator,pcacjr/qt-creator,richardmg/qtcreator,pcacjr/qt-creator,jonnor/qt-creator,ostash/qt-creator-i18n-uk,bakaiadam/collaborative_qt_creator,malikcjm/qtcreator,ostash/qt-creator-i18n-uk,KDE/android-qt-creator,omniacreator/qtcreator,colede/qtcreator,Distrotech/qtcreator,sandsmark/qtcreator-minimap,hdweiss/qt-creator-visualizer,KDAB/KDAB-Creator,kuba1/qtcreator,kuba1/qtcreator,maui-packages/qt-creator,darksylinc/qt-creator,renatofilho/QtCreator,sandsmark/qtcreator-minimap,sandsmark/qtcreator-minimap,AltarBeastiful/qt-creator,richardmg/qtcreator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,omniacreator/qtcreator,danimo/qt-creator,pcacjr/qt-creator,omniacreator/qtcreator,amyvmiwei/qt-creator,renatofilho/QtCreator,AltarBeastiful/qt-creator,hdweiss/qt-creator-visualizer,AltarBeastiful/qt-creator,bakaiadam/collaborative_qt_creator,renatofilho/QtCreator,azat/qtcreator,pcacjr/qt-creator,omniacreator/qtcreator,azat/qtcreator,colede/qtcreator,amyvmiwei/qt-creator,KDE/android-qt-creator,farseerri/git_code,Distrotech/qtcreator,ostash/qt-creator-i18n-uk,KDE/android-qt-creator,kuba1/qtcreator,farseerri/git_code,duythanhphan/qt-creator,maui-packages/qt-creator,duythanhphan/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,KDE/android-qt-creator,farseerri/git_code,KDE/android-qt-creator,AltarBeastiful/qt-creator,yinyunqiao/qtcreator,amyvmiwei/qt-creator,yinyunqiao/qtcreator,darksylinc/qt-creator,duythanhphan/qt-creator,bakaiadam/collaborative_qt_creator,farseerri/git_code,xianian/qt-creator,ostash/qt-creator-i18n-uk,Distrotech/qtcreator,danimo/qt-creator,dmik/qt-creator-os2,xianian/qt-creator,Distrotech/qtcreator,maui-packages/qt-creator