Assign focus to the notebook in the ERC/DRC window after running

After running the ERC/DRC, the window would not get focus returned to it
on GTK naturally unless the user pressed the arrow key. This prevented
the ESC key from closing the window after the run was complete and
nothing else was clicked/pressed.

Instead of pulling focus to the dataview with the errors in it (which
would cause problems in GTK, such as moving the viewport to the first
marker (https://gitlab.com/kicad/code/kicad/-/issues/11925), give focus
to the notebook container instead. This will not select the marker, but
still allow the ESC to propagate into the dialog immediately.

eeschema/dialogs/dialog_erc.cpp

@@ -451,9 +451,7 @@ void DIALOG_ERC::OnRunERCClick( wxCommandEvent& event )
     {
         wxMilliSleep( 500 );
         m_runningResultsBook->ChangeSelection( 1 );
-#ifndef __WXGTK__
-        KIPLATFORM::UI::ForceFocus( m_markerDataView );
-#endif
+        KIPLATFORM::UI::ForceFocus( m_notebook );
     }
 
     m_ercRun = true;

pcbnew/dialogs/dialog_drc.cpp

@@ -325,9 +325,7 @@ void DIALOG_DRC::OnRunDRCClick( wxCommandEvent& aEvent )
     {
         wxMilliSleep( 500 );
         m_runningResultsBook->ChangeSelection( 1 );
-#ifndef __WXGTK__
-        KIPLATFORM::UI::ForceFocus( m_markerDataView );
-#endif
+        KIPLATFORM::UI::ForceFocus( m_Notebook );
     }
 
     refreshEditor();