Removing unused import of "os"

plugins/USBPrinting/PrinterConnection.py

@@ -8,7 +8,6 @@ import time
 import queue
 import re
 import functools
-import os
 import os.path
 
 from UM.Application import Application

plugins/USBPrinting/USBPrinterManager.py

@@ -19,7 +19,6 @@ import threading
 import platform
 import glob
 import time
-import os
 import os.path
 import sys
 from UM.Extension import Extension