uitest: set id for chart window

Change-Id: I443dcccf6d560c252da38a0f0c63cc48a212c127
Reviewed-on: https://gerrit.libreoffice.org/26494Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

chart2/source/controller/main/ChartWindow.cxx

@@ -55,6 +55,7 @@ ChartWindow::ChartWindow( ChartController* pController, vcl::Window* pParent, Wi
         , m_pOpenGLWindow(nullptr)
 #endif
 {
+    set_id("chart_window");
     this->SetHelpId( HID_SCH_WIN_DOCUMENT );
     this->SetMapMode( MapMode(MAP_100TH_MM) );
     adjustHighContrastMode();