Created by: andrewemery
Fixes incorrect query header collection constants
The OpenAPI generator converts OpenAPI v2 documents into an OpenAPI v3 representation. The query parameter collection formats are squeezed into different values from the raw OpenAPI 2 collection format values.
For example: csv -> space
See: DefaultCodegen#getCollectionFormat
To fix https://github.com/OpenAPITools/openapi-generator/issues/4285