Use of graphql_connection_query_args filter breaks User Role Connections

[justlevine]

Tl;dr when wp-graphql-polylang is enabled, queries with user.role cause an Internal Server Error. This is due to graphqul_connection_query_args expecting an array, even though UserRoleConnectionResolver returns null.

Details here: (wp-graphql/wp-graphql#2048))

The simple solution is to drop the array type from the $query_args argument in __filter_graphql_connection_args().