[py][cmd2] Fix opmodes merge (#8473)

Looks like a build failure got lost in the landing order of python
commands and the big opmode change. This makes it compile again, based
on the java / C++ changes from the opmode PR.

commandsv2/src/test/python/test_robotdisabledcommand.py

@@ -7,7 +7,6 @@ if TYPE_CHECKING:
     from .util import *
 
 import pytest
-from wpilib import RobotState
 
 
 def test_robotDisabledCommandCancel(scheduler: commands2.CommandScheduler):