Add litframefinder-relevant arguments to update_config script

Adds use_litframe_finder, litframe_device_id and energy_threshold to the list of exposed arguments.

Also, as a German I could not resist fixing typ to type.

@esobolev Albeit very ugly, this is currently the only non-xcal-way to change the calibration configuration. In principle you don't need pycalibration installed for it to work, but I trust you have such an environment anyway to run it.

tests/test_update_config.py

@@ -95,6 +95,9 @@ EXPECTED_CONF = [
                        'msg': 'Range list of maximum pulse indices '
                               '(--max-pulses start end step). '
                               '3 max input elements. '},
+        'use-litframe-finder': {'type': str},
+        'litframe-device-id': {'type': str},
+        'energy-threshold': {'type': int}
         'no-rel-gain': {'type': bool},
         'no-xray-gain': {'type': bool},
         'no-blc-noise': {'type': bool},