Set mode to decompression for Gunzip interface

Co-authored-by: Chris Markiewicz <[email protected]>

Author: ghisvail

nipype/algorithms/misc.py

@@ -332,7 +332,7 @@ def _list_outputs(self):
 
 
 class GunzipInputSpec(GzipInputSpec):
-    mode = traits.Enum("decompress", "compress", usedefault=True,
+    mode = traits.Enum("decompress", usedefault=True,
                        desc="decompress or compress")