fix: Set optimizer training to false

Author: YoanSallami

synalinks/src/trainers/trainer.py

@@ -342,7 +342,7 @@ async def fit(
         validation_steps=None,
         validation_batch_size=None,
         validation_freq=1,
-        train_optimizer=True,
+        train_optimizer=False,
     ):
         """Trains the program for a fixed number of epochs (dataset iterations).