🐛 Fix missing `_chamberTemp` definition
🐛 Fix missing `_chamberTemp` definition

Closes #3089

foosel/OctoPrint,Jaesin/OctoPrint,foosel/OctoPrint,Jaesin/OctoPrint,foosel/OctoPrint,foosel/OctoPrint,Jaesin/OctoPrint,Jaesin/OctoPrint