Bug: User can change nickname with special character as 1st letter and with 2 spaces.

[Dmitrydrum]

Summary

There is an inconsistency with nickname's requirements. User can change nickname through settings with 2 spaces and special character as 1st letter, but user cannot do it when register a new account.
Current version: babf5ed
Prerequisites:
User is logged in
Lobby page is opened https://codebattle.hexlet.io/#lobby
Nickname has not been taken already

Reproduction steps

1. Click on profile icon
2. Click on "settings"
3. Type "@  2" in "Your name" field
4. Click on "save" button

Expected result

Nickname doesn't change. Validation error occurs

Actual result

Nickname does change.

Browsers

Chrome

OS

Windows