QmlDesigner.ImportManager: adding tooltip to ImportLabel remove button

Change-Id: I5b057b393531e80f7be0f86676c98b396532d8aa
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmldesigner/components/importmanager/importlabel.cpp

@@ -50,6 +50,7 @@ ImportLabel::ImportLabel(QWidget *parent) :
     m_removeButton->setMaximumHeight(20);
     m_removeButton->setFocusPolicy(Qt::NoFocus);
     m_removeButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+    m_removeButton->setToolTip(tr("Remove Import"));
     connect(m_removeButton, SIGNAL(clicked()), this, SLOT(emitRemoveImport()));
     layout->addWidget(m_removeButton);