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/autotest/testresultspane.cpp

@@ -74,6 +74,7 @@ TestResultsPane::TestResultsPane(QObject *parent) :
     IOutputPane(parent),
     m_context(new IContext(this))
 {
+    setId("TestResults");
     setDisplayName(Tr::tr("Test Results"));
     m_outputWidget = new QStackedWidget;
     QWidget *visualOutputWidget = new QWidget;