Refresh materialized view of a router query does not go through router planner

`create materialized view` works fine, but `refresh materialized view ` fails. An example fix: https://github.com/citusdata/citus/commit/48025072431e3946ff342ff3e230840de6e08bbc

See discussions here: https://github.com/citusdata/citus/pull/4292/files#r517340937

```SQL
create materialized view router_view as select * from users_table WHERE user_id = 1 FOR UPDATE;
SELECT 7
Time: 133.988 ms
refresh materialized view router_view ;
ERROR: could not run distributed query with FOR UPDATE/SHARE commands
HINT: Consider using an equality filter on the distributed table's partition column.
Time: 3.502 ms
```

The bug is reproducible at least from Citus 8.3