klippy: Introduce load_config_prefix() for modules that take parameters

Use both load_config() and load_config_prefix() functions when
dynamically loading a module from the extras directory - if the config
section name has parameters in it then use load_config_prefix().

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

klippy/extras/delta_calibrate.py

@@ -71,6 +71,4 @@ class DeltaCalibrate:
                 new_params['radius']))
 
 def load_config(config):
-    if config.get_name() != 'delta_calibrate':
-        raise config.error("Invalid delta_calibrate config name")
     return DeltaCalibrate(config)