Remove unnecessary parenthesis

Pointed out during code review.

Author: AlexanderWells-diamond

softioc/device_core.py

@@ -5,7 +5,7 @@
 from ctypes import *
 
 
-class DeviceCommon():
+class DeviceCommon:
     # By requiring that DeviceCommon be a common base class for the entire
     # Python device hierarchy, we can use this __init__ to test for unused
     # keyword arguments.