Fix X-Ray propagators import in manual app (#39)

Author: NathanielRN

integration-test-apps/manual-instrumentation/flask/create_flask_app.py

@@ -10,7 +10,7 @@
 from flask import Flask, session
 import logging
 from opentelemetry import trace
-from opentelemetry.aws.propagators.aws_xray_propagator import (
+from opentelemetry.propagators.aws.aws_xray_propagator import (
     TRACE_ID_DELIMITER,
     TRACE_ID_FIRST_PART_LENGTH,
     TRACE_ID_VERSION,