Support additional screen layouts.

Allows users to choose a single screen layout or a large screen layout.
Adds a configuration option to change the prominent screen.

src/citra_qt/configure_dialog.cpp

@@ -23,4 +23,5 @@ void ConfigureDialog::applyConfiguration() {
     ui->graphicsTab->applyConfiguration();
     ui->audioTab->applyConfiguration();
     ui->debugTab->applyConfiguration();
+    Settings::Apply();
 }