Remove unused import

Contributes to issue CURA-5034.

plugins/UM3NetworkPrinting/ClusterUM3OutputDevice.py

@@ -18,7 +18,6 @@ from cura.PrinterOutput.PrinterOutputModel import PrinterOutputModel
 from cura.PrinterOutput.PrintJobOutputModel import PrintJobOutputModel
 from cura.PrinterOutput.MaterialOutputModel import MaterialOutputModel
 from cura.PrinterOutput.NetworkCamera import NetworkCamera
-from cura.PrinterOutputDevice import ConnectionState #To see when we're fully connected.
 
 from .ClusterUM3PrinterOutputController import ClusterUM3PrinterOutputController
 from .SendMaterialJob import SendMaterialJob