lokdocview: Handle keypad enter

Change-Id: Ia892c346d4a3c0a5439c7977963cc502d287e6f7
Reviewed-on: https://gerrit.libreoffice.org/33445Reviewed-by: pranavk <pranavk@collabora.co.uk>
Tested-by: pranavk <pranavk@collabora.co.uk>

libreofficekit/source/gtk/lokdocview.cxx

@@ -723,6 +723,7 @@ signalKey (GtkWidget* pWidget, GdkEventKey* pEvent)
         nKeyCode = com::sun::star::awt::Key::DELETE;
         break;
     case GDK_KEY_Return:
+    case GDK_KEY_KP_Enter:
         nKeyCode = com::sun::star::awt::Key::RETURN;
         break;
     case GDK_KEY_Escape: