Remove explicit provider region as variable and use inherited provider

Author: MarcMeszaros

variables.tf

@@ -1,7 +1,3 @@
-variable "region" {
-  type = string
-}
-
 variable "ssh_key_id" {
   description = "A SSH public key ID to add to the VPN instance."
 }

versions.tf

@@ -10,7 +10,3 @@ terraform {
     }
   }
 }
-
-provider "aws" {
-  region = var.region
-}