Allow us to erase the Set parameter type

In This code:
```
Private _prop1 As String
Public Property Prop1() As String
Get
Return _prop1
End Get
Set(value)
_prop1 = value
End Set
End Property
End Class
```

I erased ```As String``` from the Set block. VB treats the Value param as if it is an object, so It gives a syntax error:
> Error BC31064 'Set' parameter must have the same type as the containing property.

I suggest to infer the Value param from the type of the property to be a string. There is will not break any thing. It is nice not to add useless syntax. It is obvious that the Set param has the same type of the property.