Fix Batch Insertion/Update for tuple-based fields

[deusaquilus]

Allowing tuple-based batch queries.

    "update via tuple" in {
      val birthYearUpdates = List((3431, 1983), (2976, 1972), (1511, 1991))
      val a = ctx.run {
        liftQuery(birthYearUpdates).foreach {
          case (id, year) =>
            query[MyPerson].filter(p => p.id == id).update(p => p.birthYear -> year)
        }
      }
      a.triple mustEqual ("UPDATE MyPerson SET birthYear = ? WHERE id = ?", List(List(1983, 3431), List(1972, 2976), List(1991, 1511)), Static)

      val b = ctx.run {
        liftQuery(birthYearUpdates).foreach((id, year) =>
          query[MyPerson].filter(p => p.id == id).update(p => p.birthYear -> year)
        )
      }
      b.triple mustEqual ("UPDATE MyPerson SET birthYear = ? WHERE id = ?", List(List(1983, 3431), List(1972, 2976), List(1991, 1511)), Static)
    }

Used to fail in TypeRepr.memberType NoDenotations owner because of how memberType was used.