fix(terraform): remove unused? app setting

this is always re-added by plan/apply, so apparently it isn't saved anyway

terraform/app_service.tf

@@ -46,7 +46,6 @@ resource "azurerm_linux_web_app" "main" {
 
   app_settings = {
     "DOCKER_REGISTRY_SERVER_URL"          = "https://ghcr.io/"
-    "WEBSITE_HTTPLOGGING_RETENTION_DAYS"  = "99999",
     "WEBSITE_TIME_ZONE"                   = "America/Los_Angeles",
     "WEBSITES_ENABLE_APP_SERVICE_STORAGE" = "false",
     "WEBSITES_PORT"                       = "8000",