configfile: Allow getchoice() to take a list

If a list is passed to getchoice(), seamlessly convert it to a dict.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/kinematics/cartesian.py

@@ -23,7 +23,7 @@ class CartKinematics:
         self.dc_module = None
         if config.has_section('dual_carriage'):
             dc_config = config.getsection('dual_carriage')
-            dc_axis = dc_config.getchoice('axis', {'x': 'x', 'y': 'y'})
+            dc_axis = dc_config.getchoice('axis', ['x', 'y'])
             self.dual_carriage_axis = {'x': 0, 'y': 1}[dc_axis]
             # setup second dual carriage rail
             self.rails.append(stepper.LookupMultiRail(dc_config))