Fix a bug that failed to display web interface on mobile devices
Fix a bug that failed to display web interface on mobile devices

cheton/cnc.js,cncjs/cncjs,cncjs/cncjs,cheton/cnc,cheton/cnc,cheton/cnc.js,cncjs/cncjs,cheton/piduino-grbl,cheton/cnc,cheton/cnc.js,cheton/piduino-grbl,cheton/piduino-grbl