kconfig: qconf: remove unnecessary lastWindowClosed() signal connection

The default value of the quitOnLastWindowClosed property is true.

Hence, the application implicitly quits when the last window is closed.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/qconf.cc

@@ -1863,7 +1863,6 @@ int main(int ac, char** av)
 	v = new ConfigMainWindow();
 
 	//zconfdump(stdout);
-	configApp->connect(configApp, SIGNAL(lastWindowClosed()), SLOT(quit()));
 	configApp->connect(configApp, SIGNAL(aboutToQuit()), v, SLOT(saveSettings()));
 
 	v->show();