Remove FIXME, there's nothing to fix there

The OutputPane::instance() is explicitly deleted, thus it should not be
deleted via qobject parent/child deletion.

Change-Id: I481e8413ce425298631278049b3fb4fabb3abcd2
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/coreplugin/outputpane.cpp

@@ -77,7 +77,6 @@ OutputPanePlaceHolder::OutputPanePlaceHolder(Core::IMode *mode, QSplitter* paren
 OutputPanePlaceHolder::~OutputPanePlaceHolder()
 {
     if (d->m_current == this) {
-        // FIXME: Prevent exit crash in debug mode.
         if (Internal::OutputPaneManager *om = Internal::OutputPaneManager::instance()) {
             om->setParent(0);
             om->hide();