[FIX] document: update environment before attachments update

Fine-tuning of commit:
b3a3ad8099
ac1e187eea

The environment should be updated before the call to _updateAttachments,
as it depends on the env active_id.

opw 1888651

closes odoo/odoo#27277

addons/document/static/src/js/document.js

@@ -50,6 +50,7 @@ Sidebar.include({
      * @override
      */
     updateEnv: function (env) {
+        this.env = env;
         var _super = _.bind(this._super, this, env);
         var def = this.hasAttachments ? this._updateAttachments() : $.when();
         def.then(_super);