bugfix: error metrics should be sent during exception handling

Signed-off-by: Joey Zhao <5253430+joeyzhao2018@users.noreply.github.com>

Author: joeyzhao2018

datadog_lambda/wrapper.py

@@ -165,7 +165,7 @@ def __call__(self, event, context, **kwargs):
             self.response = self.func(event, context, **kwargs)
             return self.response
         except Exception:
-            if not should_use_extension:
+            if should_use_extension:
                 from datadog_lambda.metric import submit_errors_metric
 
                 submit_errors_metric(context)