Remove dead code

Author: Aditya-Gupta26

pufferlib/config/ocean/drive.ini

@@ -573,8 +573,6 @@ enabled = False
 mode = full
 ; Overrides train.learning_rate when enabled. None = inherit train.learning_rate.
 base_lr = None
-; Warn (and ignore) when overlay sets keys locked to the base checkpoint.
-strip_locked_keys = True
 ; Regex over named_parameters; matched params get requires_grad=False (used by
 ; mode=freeze; also additive on top of mode=lora).
 freeze_regex = None