Fix rounding for DiD results.

Author: anevolbap

causalpy/pymc_experiments.py

@@ -709,7 +709,7 @@ def summary(self, round_to=None) -> None:
         print(f"{self.expt_type:=^80}")
         print(f"Formula: {self.formula}")
         print("\nResults:")
-        print(round_num(self._causal_impact_summary_stat(), round_to))
+        print(self._causal_impact_summary_stat(round_to))
         self.print_coefficients(round_to)