Uncomment FlaskInstrumentor import in test file

Author: 123liuziming

instrumentation/opentelemetry-instrumentation-flask/tests/test_flask_compatibility.py

@@ -27,9 +27,9 @@
 
 from opentelemetry import trace
 from opentelemetry.instrumentation.flask import (
-    FlaskInstrumentor,
     _ENVIRON_ACTIVATION_KEY,
     _ENVIRON_TOKEN,
+    FlaskInstrumentor,
     _request_ctx_ref,
 )
 from opentelemetry.test.wsgitestutil import WsgiTestBase