fix for wrong cursor when in wait state bug 48839 r=bruce

widget/src/gtk/nsWindow.cpp

@@ -989,7 +989,7 @@ NS_IMETHODIMP nsWindow::SetCursor(nsCursor aCursor)
          break;
  
        case eCursor_spinning:
-         newCursor = gdk_cursor_new(GDK_EXCHANGE);
+         newCursor = gdk_cursor_new(GDK_WATCH);
          break;
  
        case eCursor_count_up: