Clean up UI scaling

indra/newview/app_settings/settings.xml

indra/newview/llstartup.cpp

indra/newview/llviewerwindow.cpp

indra/newview/llviewerwindow.h

indra/newview/skins/default/xui/de/notifications.xml

indra/newview/skins/default/xui/en/notifications.xml

indra/newview/skins/default/xui/es/notifications.xml

indra/newview/skins/default/xui/fr/notifications.xml

indra/newview/skins/default/xui/it/notifications.xml

indra/newview/skins/default/xui/ja/notifications.xml

indra/newview/skins/default/xui/pt/notifications.xml

indra/newview/skins/default/xui/ru/notifications.xml

indra/newview/skins/default/xui/tr/notifications.xml

indra/newview/skins/default/xui/zh/notifications.xml