Query params don't work with LambdaFunctionUrlResolver

To reproduce:

docker build --provenance=false -t bug:0.0.1 .
docker run -i -p 8080:8080 bug:0.0.1
curl -XPOST "http://localhost:8080/2015-03-31/functions/function/invocations" --data "@request.json"

Observe that the response is

{
    "completed": null
}

even though the query string parameter is supplied in the request.

To develop locally:

pipenv install
pipenv run python reproduce.py < request.json