Fixes Terraform code of Azure Web Apps + CosmosDB for MongoDB sample (#58)

Author: paolosalvatori

samples/web-app-cosmosdb-mongodb-api/python/terraform/main.tf

@@ -4,7 +4,6 @@ locals {
   suffix                      = lower(var.suffix)
   resource_group_name         = "${var.prefix}-rg"
   log_analytics_name          = "${local.prefix}-log-analytics-${local.suffix}"
-  storage_account_name        = "${local.prefix}datastore${local.suffix}"
   virtual_network_name        = "${local.prefix}-vnet-${local.suffix}"
   nat_gateway_name            = "${local.prefix}-nat-gateway-${local.suffix}"
   private_endpoint_name       = "${local.prefix}-mongodb-pe-${local.suffix}"