Pass the modified hparams to the modalities, so they can know the mode.

PiperOrigin-RevId: 176688435

Author: nshazeer

tensor2tensor/utils/t2t_model.py

@@ -117,7 +117,7 @@ def __init__(self,
     self._ps_devices = ps_devices
     self._problem_hparams = problem_hparams
     self._problem_idx = problem_idx
-    self._create_modalities(problem_hparams, hparams)
+    self._create_modalities(problem_hparams, self._hparams)
 
   def set_mode(self, mode):
     """Set hparams with the given mode."""