AutoOpen and RequireQualifiedAccess can both be specified on a module

Consider the following code:

```fsharp
[]
module M =
let f x = ()

f 12 // Compiles!
```

Now consider this code:

```fsharp
[]
module M =
let f x = ()

open M // Compile error!

f 12
```

In the second example, we cannot `open M` because of the `RequireQualifiedAccess` attribute.

However, we can get around that by plopping `AutoOpen` in the attribute list and removing the `open M` declaration.