caddyhttp: Remove server name from metrics

For some reason this breaks automatic HTTP->HTTPS redirects. I am not
sure why yet, but as a hotfix remove this until we understand it better.

modules/caddyhttp/app.go

@@ -226,8 +226,6 @@ func (app *App) Provision(ctx caddy.Context) error {
 		// route handler so that important security checks are done, etc.
 		primaryRoute := emptyHandler
 		if srv.Routes != nil {
-			// inject the server name for observability purposes
-			ctx.Context = contextWithServerName(ctx.Context, srvName)
 			err := srv.Routes.ProvisionHandlers(ctx)
 			if err != nil {
 				return fmt.Errorf("server %s: setting up route handlers: %v", srvName, err)