Build fixes

src/gui/dialogs/screenshot_notification.cpp

@@ -130,7 +130,7 @@ void screenshot_notification::save_screenshot()
 	if(!res) {
 		gui2::show_error_message(
 			translation::dsgettext("wesnoth", "Screenshot creation failed.\n\n"
-				"Make sure there is enough space on the drive holding Wesnoth’s player resource files and that file permissions are set up correctly."));
+				"Make sure there is enough space on the drive holding Wesnoth’s player resource files and that file permissions are set up correctly."));
 	} else {
 		path_box.set_active(false);
 		find_widget<button>(&window, "open", false).set_active(true);

src/tests/gui/test_gui2.cpp

@@ -984,7 +984,7 @@ struct dialog_tester<screenshot_notification>
 {
 	screenshot_notification* create()
 	{
-		return new screenshot_notification("path");
+		return new screenshot_notification("path", nullptr);
 	}
 };