aws_dx_private_virtual_interface.sitelink_enabled field should be specified

[displague]

With AWS provider v4.25.0, the sitelink_enabled field should be defined to the default of false, rather than not specified to avoid the condition where the aws_dx_private_virtual_interface is recreated on each refresh.

-/+ resource "aws_dx_private_virtual_interface" "this" {
      ~ amazon_side_asn     = "..." -> (known after apply)
      ~ arn                 = "..." -> (known after apply)
      ~ aws_device          = "..." -> (known after apply)
      ~ id                  = "..." -> (known after apply)
      ~ jumbo_frame_capable = true -> (known after apply)
        name                = "..."
      - sitelink_enabled    = false -> null