stepconf -add error highlighting to axis page
stepconf -add error highlighting to axis page

When an value of error is entered it was not
obvious what was needed to be fixed.
now it is highlighted in red

Signed-off-by: Chris Morley <663b38f0e776e9171484159033cf8a402a4c1654@hotmail.com>

bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror