fix: use Directory from base

Author: satra

nipype/interfaces/elastix/base.py

@@ -16,13 +16,13 @@
 """
 
 from ..base import (CommandLine, CommandLineInputSpec, isdefined,
-                    TraitedSpec, File, traits, InputMultiPath)
+                    TraitedSpec, File, Directory, traits, InputMultiPath)
 from ... import logging
 logger = logging.getLogger('interface')
 
 
 class ElastixBaseInputSpec(CommandLineInputSpec):
-    output_path = traits.Directory('./', exists=True, mandatory=True, usedefault=True,
-                              argstr='-out %s', desc='output directory')
+    output_path = Directory('./', exists=True, mandatory=True, usedefault=True,
+                            argstr='-out %s', desc='output directory')
     num_threads = traits.Int(1, argstr='-threads %01d',
                              desc='set the maximum number of threads of elastix')