Update core.py

Update fromatting

micropython/usb/usb-device/usb/device/core.py

@@ -166,7 +166,9 @@ class _Device:
         # Keep track of the interface and endpoint indexes
         itf_num = builtin_driver.itf_max
         ep_num = max(builtin_driver.ep_max, 1)  # Endpoint 0 always reserved for control
-        while len(strs) < builtin_driver.str_max - 1: # This is possibly unnecessary or wrong because
+        while (
+            len(strs) < builtin_driver.str_max - 1
+        ):  # This is possibly unnecessary or wrong because
             # https://docs.micropython.org/en/latest/library/machine.USBDevice.html
             # states all string values except index 0 should be plain ASCII
             strs.append(None)  # Reserve other string indexes used by builtin drivers