GH-1003 add some save locking for dialog pages that deal with settings

application/pages/global/MinecraftPage.cpp

@@ -62,6 +62,8 @@ void MinecraftPage::applySettings()
 {
 	auto s = MMC->settings();
 
+	SettingsObject::Lock lock(s);
+
 	// Window Size
 	s->set("LaunchMaximized", ui->maximizedCheckBox->isChecked());
 	s->set("MinecraftWinWidth", ui->windowWidthSpinBox->value());