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/projectexplorer/compileoutputwindow.cpp

@@ -50,6 +50,7 @@ CompileOutputWindow::CompileOutputWindow(QAction *cancelBuildAction) :
     m_cancelBuildButton(new QToolButton),
     m_settingsButton(new QToolButton)
 {
+    setId("CompileOutput");
     setDisplayName(QCoreApplication::translate("QtC::ProjectExplorer", "Compile Output"));
     Core::Context context(C_COMPILE_OUTPUT);
     m_outputWindow = new Core::OutputWindow(context, SETTINGS_KEY);