RunControl: Show correct icon in application output

Add a virtual icon() method to runcontrol.
Actually currently the icon only varies between modes of running.

Task-Nr: QTCREATORBUG-1232

src/plugins/qmlprojectmanager/qmlprojectruncontrol.cpp

@@ -113,6 +113,11 @@ bool QmlRunControl::isRunning() const
     return m_applicationLauncher.isRunning();
 }
 
+QIcon QmlRunControl::icon() const
+{
+    return QIcon(ProjectExplorer::Constants::ICON_RUN_SMALL);
+}
+
 void QmlRunControl::slotBringApplicationToForeground(qint64 pid)
 {
     bringApplicationToForeground(pid);