Rename some screen classes

UI/PauseScreen.cpp

@@ -328,7 +328,7 @@ void GamePauseScreen::update() {
 }
 
 GamePauseScreen::GamePauseScreen(const Path &filename, bool bootPending)
-	: UIDialogScreenWithGameBackground(filename), bootPending_(bootPending) {
+	: UIBaseDialogScreen(filename), bootPending_(bootPending) {
 	// So we can tell if something blew up while on the pause screen.
 	std::string assertStr = "PauseScreen: " + filename.GetFilename();
 	SetExtraAssertInfo(assertStr.c_str());