Don't always insert the openid scope in upstream OAuth 2.0 requests

Author: sandhose

crates/oidc-client/src/requests/authorization_code.rs

@@ -255,8 +255,6 @@ fn build_authorization_request(
         (None, None)
     };
 
-    scope.insert(OPENID);
-
     let auth_request = FullAuthorizationRequest {
         inner: AuthorizationRequest {
             response_type: OAuthAuthorizationEndpointResponseType::Code.into(),