Various changes in Python code

controller/python/check-firmware.py

@@ -79,7 +79,7 @@ def check_firmware():
     print("- Check that a positive I stays behind the target")
     c.set_motor_speed(30, 30)
     time.sleep(0.5)
-    (left, right) = c.get_pid_i_accumulator()
+    (left, right) = c.get_pid_i_accumulators()
     assert left > 0 and right > 0
     time.sleep(1)