Remove deprecated option for private_networking

resource.digitalocean_droplet.this.tf

@@ -1,13 +1,12 @@
 resource "digitalocean_droplet" "this" {
-  backups            = "true"
-  image              = var.image_name
-  ipv6               = "true"
-  monitoring         = "true"
-  name               = "${var.host_name}.${var.domain_name}"
-  private_networking = var.use_vpc > 0 ? "true" : "false"
-  region             = var.region
-  ssh_keys           = var.ssh_keys
-  size               = var.size
-  tags               = var.tags
-  vpc_uuid           = var.use_vpc > 0 ? data.digitalocean_vpc.this[0].id : null
+  backups    = "true"
+  image      = var.image_name
+  ipv6       = "true"
+  monitoring = "true"
+  name       = "${var.host_name}.${var.domain_name}"
+  region     = var.region
+  ssh_keys   = var.ssh_keys
+  size       = var.size
+  tags       = var.tags
+  vpc_uuid   = var.use_vpc > 0 ? data.digitalocean_vpc.this[0].id : null
 }