Fix debug assert that'd occur when closing the debug menu

Closing the settings window will immediately flush a temporary 0, 0 value it writes for the size which gets overwritten by the MainWindow a few seconds later.

In the code, -1 is considered the "off" state, and 0 is considered a "it should be saved, but only whenever the value is available". The save gamepad size/pos option already worked like this new behavior, since you might enable the option but not (previously) have it open yet. When encountering a 0 as the size, it'll just use the default window size of Cemu.

src/config/XMLConfig.h

@@ -480,8 +480,8 @@ class XMLChildConfig
 	{
 		m_parentConfig = {
 			.lock = [getParentConfig]() { return getParentConfig().Lock(); },
-			.save = [getParentConfig]() { return getParentConfig().Load(); },
-			.load = [getParentConfig]() { return getParentConfig().Save(); },
+			.save = [getParentConfig]() { return getParentConfig().Save(); },
+			.load = [getParentConfig]() { return getParentConfig().Load(); },
 		};
 
 		auto configParser = std::make_pair(

src/gui/wxgui/MainWindow.cpp

@@ -1299,7 +1299,7 @@ void MainWindow::LoadSettings()
 	if (config.window_position != Vector2i{ -1,-1 })
 		this->SetPosition({ config.window_position.x, config.window_position.y });
 
-	if (config.window_size != Vector2i{ -1,-1 })
+	if (config.window_size.x > 0 && config.window_size.y > 0)
 	{
 		this->SetSize({ config.window_size.x, config.window_size.y });
 

src/gui/wxgui/wxCemuConfig.cpp

@@ -136,7 +136,6 @@ void wxCemuConfig::Save(XMLConfigParser& config)
 	wpos.set<sint32>("y", window_position.y);
 	auto wsize = config.set("window_size");
 	wsize.set<sint32>("x", window_size.x);
-	cemu_assert_debug(window_size.x != 0);
 	wsize.set<sint32>("y", window_size.y);
 	config.set<bool>("window_maximized", window_maximized);