QbsPM: Clear progress bar on project unload
QbsPM: Clear progress bar on project unload

Change-Id: I4f695a74032aa9f1e1b4d45f17ab8c4170717297
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@digia.com>

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