Replace with underscore code fix should not be proposed for class identifiers

[psfinaki]

This actually breaks the code:

bugger.mp4

type Animal(name:string) =
    member val Name = name with get, set

type Dog(name:string) as this = 
    inherit Animal(name)

    member this.Bark() =
        printfn "%s says Woof!" this.Name

[psfinaki]

Oops, duplicate of this, closing.