fix(transforms): string formating forgotten when writing ITK transforms

Author: oesteban

nibabel/transform/linear.py

@@ -180,7 +180,7 @@ def to_filename(self, filename, fmt='X5', moving=None):
 Parameters: {}
 FixedParameters: 0 0 0\n""".format
             with open(filename, 'w') as f:
-                f.write(itkfmt(' '.join(['%g' for p in parameters])))
+                f.write(itkfmt(' '.join(['%g' % p for p in parameters])))
             return filename
 
         if fmt.lower() == 'afni':