Only enable save_metric=1 when adapt engaged

Author: amas0

cmdstanpy/cmdstan_args.py

@@ -273,7 +273,8 @@ def compose(self, idx: int, cmd: list[str]) -> list[str]:
             cmd.append(f'window={self.adapt_metric_window}')
         if self.adapt_step_size is not None:
             cmd.append('term_buffer={}'.format(self.adapt_step_size))
-        cmd.append('save_metric=1')
+        if self.adapt_engaged:
+            cmd.append('save_metric=1')
         # End adapt subsection
 
         if self.num_chains > 1: