Fix duplicated query params being sent to next from apigw v1 events #101
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v1 event contain all params in multiValueQueryStringParameters. Atm there is a bug where all params get duplicated in when sent to next.
eg an input path to the api gw:
/?step=1
becomes/step=1&step=1
after we reconstruct the query params from the v1 event. The solution in this PR i to just check the multiValueQueryStringParameters object as that one will be populated even in cases where there isn't any multi-values.