OutputPane: Add an id() for the settings

It was using the displayName for the key in the settings (visibility and
shortcut), which is annoying when changing the language.

Change-Id: Iffa784347c59389599c90f468dcba15834599c39
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/todo/todooutputpane.cpp

@@ -26,6 +26,7 @@ TodoOutputPane::TodoOutputPane(TodoItemsModel *todoItemsModel, const Settings *s
     m_todoItemsModel(todoItemsModel),
     m_settings(settings)
 {
+    setId("To-DoEntries");
     setDisplayName(Tr::tr("To-Do Entries"));
     createTreeView();
     createScopeButtons();