cleanup: fix deepscan issues (#3740)

* fix: don't double check if shards are auto.

* fix: remove useless roles array.

* fix: remove useless undefined checks.

* fix: remove useless `this` binding

* Apply suggestions from code review

Co-Authored-By: Sugden <28943913+NotSugden@users.noreply.github.com>

* Fix: Space's suggestion

* Fix: time is always truthy

* Check if it's an invalid date.

Co-authored-by: Sugden <28943913+NotSugden@users.noreply.github.com>

src/structures/Guild.js

@@ -775,6 +775,7 @@ class Guild extends Base {
         }
         roles.push(role.id);
       }
+      options.roles = roles;
     }
     return this.client.api.guilds(this.id).members(user).put({ data: options })
       .then(data => this.members.add(data));