CURA-1104: Fix the incorrect "failed to eject drive" message for windows.

The C windows API call was wrong. The lpBytesReturned parameter was set to
NULL. While the docmentation at:
aa363406(v=vs.85).aspx
states that it CANNOT be NULL if lpOverlapped is NULL. Overlapped is for
async operations. So the easiest way to fix this is to supply a proper
pointer.

I've also removed unused includes. And supplied the DeviceIoControl with
proper ctypes calling information to prevent other python->c problems.

plugins/RemovableDriveOutputDevice/RemovableDrivePlugin.py

@@ -4,9 +4,9 @@
 import threading
 import time
 
-from UM.Signal import Signal
 from UM.Message import Message
 from UM.OutputDevice.OutputDevicePlugin import OutputDevicePlugin
+from UM.Logger import Logger
 
 from . import RemovableDriveOutputDevice
 from UM.Logger import Logger