Actually fix #1753 which broke after codemirror upgrade - refs #1204
Actually fix #1753 which broke after codemirror upgrade - refs #1204

Zhao-Qi/tilemill,mbrukman/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,nyimbi/tilemill,mbrukman/tilemill,tizzybec/tilemill,MappingKat/tilemill,MappingKat/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,fxtentacle/tilemill,tilemill-project/tilemill,Zhao-Qi/tilemill,paulovieira/tilemill-clima,mbrukman/tilemill,nyimbi/tilemill,fxtentacle/tilemill,paulovieira/tilemill-clima,mbrukman/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,tilemill-project/tilemill,fxtentacle/tilemill,tizzybec/tilemill,Zhao-Qi/tilemill,tizzybec/tilemill,florianf/tileoven,mbrukman/tilemill,florianf/tileoven,nyimbi/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,fxtentacle/tilemill,Zhao-Qi/tilemill,paulovieira/tilemill-clima,fxtentacle/tilemill,nyimbi/tilemill,florianf/tileoven,tilemill-project/tilemill,paulovieira/tilemill-clima,tizzybec/tilemill,nyimbi/tilemill,tizzybec/tilemill,paulovieira/tilemill-clima,MappingKat/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,Zhao-Qi/tilemill,MappingKat/tilemill,MappingKat/tilemill