Fix deprecation warning related to #reload
Fix deprecation warning related to #reload

This fixes:

```
DEPRECATION WARNING: Passing an argument to force an association to
reload is now deprecated and will be removed in Rails 5.1. Please call
`reload` on the result collection proxy instead. (called from
can_own_more_enterprises? at /usr/src/app/app/models/spree/user.rb:112)
```

This method in particular gets called a lot of times so it'll have it's
cost in performance.

lin-d-hop/openfoodnetwork,mkllnk/openfoodnetwork,lin-d-hop/openfoodnetwork,Matt-Yorkley/openfoodnetwork,mkllnk/openfoodnetwork,lin-d-hop/openfoodnetwork,mkllnk/openfoodnetwork,openfoodfoundation/openfoodnetwork,openfoodfoundation/openfoodnetwork,openfoodfoundation/openfoodnetwork,mkllnk/openfoodnetwork,lin-d-hop/openfoodnetwork,Matt-Yorkley/openfoodnetwork,openfoodfoundation/openfoodnetwork,Matt-Yorkley/openfoodnetwork,Matt-Yorkley/openfoodnetwork