nuke: gizmo loader was also having unicode type tests

openpype/hosts/nuke/plugins/load/load_gizmo_ip.py

@@ -1,5 +1,5 @@
 import nuke
-
+import six
 from avalon import io
 
 from openpype.pipeline import (
@@ -243,8 +243,8 @@ def byteify(self, input):
  for key, value in input.items()}
  elif isinstance(input, list):
  return [self.byteify(element) for element in input]
- elif isinstance(input, unicode):
- return input.encode('utf-8')
+ elif isinstance(input, six.text_type):
+ return str(input)
  else:
  return input