fix simple yet troublesome error

Author: roger-zhangg

aws_lambda_powertools/logging/formatter.py

@@ -144,6 +144,8 @@ def __init__(
 
         if self.utc:
             self.converter = time.gmtime
+        else:
+            self.converter = time.localtime
 
         self.keys_combined = {**self._build_default_keys(), **kwargs}
         self.log_format.update(**self.keys_combined)