Ouath: /oauth/authorize endpoint doesn't sends state paramter to login page

[komalsukhani]

Branch/Environment/Version
master

Describe the bug
/oauth/authorize endpoint doesn't sends state parameter while redirecting to Login page

Reproduction steps

1. Import TykDefinition.txt
2. Create Oauth client for above API
3. Send below curl request

curl -v "http://tyk-gateway:8181/test/oauth/authorize?response_type=code&client_id={CLIENT_ID}&redirect_uri=http://httpbin.org&state=94290ea6-4d3d-4e98-be36-4c9aaed916d8"

Note: Replace CLIENT_ID with one generated in Step 2

You will notice that while redirecting to login page state parameter is not sent.

Expected behavior
state parameter should have been sent to login page