Set provider_ignores_state option as true

Author: vinothkannans

plugin.rb

@@ -29,7 +29,7 @@ def register_middleware(omniauth)
                         opts = env['omniauth.strategy'].options
                         opts[:client_id] = SiteSetting.oauth2_client_id
                         opts[:client_secret] = SiteSetting.oauth2_client_secret
-                        opts[:provider_ignores_state] = false
+                        opts[:provider_ignores_state] = true
                         opts[:client_options] = {
                           authorize_url: SiteSetting.oauth2_authorize_url,
                           token_url: SiteSetting.oauth2_token_url,