ProjectTree: Fix crashes on removing folder nodes
ProjectTree: Fix crashes on removing folder nodes

The code that invalidates m_currentNode folder nodes on removing wasn't
run due to a typo.

Change-Id: Ib7d545da4078275b2875c9a4c6246909234c8073
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@theqtcompany.com>

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