OTHER: Fix memleak and fixed small bug in hideEvent handlers

When promoe was minimized or on a different virtual desktop when it was quit,
the visible setting of playlist and equalizer was set to false.
So even when those two were visible before switching to a different desktop
they where set to closed when promoe was started the next time

src/mainwindow/mainwindow.cpp

@@ -39,6 +39,7 @@ MainWindow::MainWindow (QWidget *parent) : BaseWindow (parent)
 {
 	QSettings s;
 
+	setWindowTitle (App->applicationName ());
 	setWindowFlags(Qt::FramelessWindowHint);
 	setMaximumSize (275, 116);
 #ifndef _WIN32