[BUG] data-dependencies break on reexport of TypeOperators

[cocreature]

Consider this example:
package dep has those two modules:

module Dep where

type (&) a b = (a, b)

``
module DepReexport
(module Dep)
where

import Dep

package `main` depends on `dep` via a `data-dependency`

This fails with

.daml/package-database/1.14/dep-0.0.1-71ebdf0c0009585fa8f6d6de8c841366c209fd2c66e2e4c5932c1d826658ad34/DepReexport.daml:10:29:
error:
Expecting a type constructor but found a variable, ‘Dep.&’.
If ‘Dep.&’ is a type constructor then enable ExplicitNamespaces and use the 'type' keyword.

We should do exactly what the error suggests and enamle ExplicitNameSpaces and use `type`.

Probably worth testing for both synonyms and type constructors.