test: bring back sed fix

Author: durran

.evergreen/config.in.yml

@@ -877,7 +877,7 @@ functions:
           ECS_SRC_DIR=$AUTH_AWS_DIR/src
 
           # fix issue with `TestData` in SERVER-46340
-          # sed -i '1s+^+TestData = {};\n+' $AUTH_AWS_DIR/lib/ecs_hosted_test.js
+          sed -i '1s+^+TestData = {};\n+' $AUTH_AWS_DIR/lib/ecs_hosted_test.js
 
           # pack up project directory to ssh it to the container
           mkdir -p $ECS_SRC_DIR/.evergreen