FIX: add usedefault metadata to trait with default

Author: effigies

Diff for: nipype/interfaces/io.py

@@ -3005,7 +3005,9 @@ class ExportFileInputSpec(BaseInterfaceInputSpec):
     in_file = File(exists=True, mandatory=True, desc="Input file name")
     out_file = File(mandatory=True, desc="Output file name")
     check_extension = traits.Bool(
-        True, desc="Ensure that the input and output file extensions match"
+        True,
+        usedefault=True,
+        desc="Ensure that the input and output file extensions match",
     )
     clobber = traits.Bool(desc="Permit overwriting existing files")