Invalid locale cookie is set in the redirect response of LocaleCookieRedirect

[okovpashko]

Describe the bug
Hello. I found a potential bug when was writing integration tests for the site that uses this plugin.

To Reproduce
Steps to reproduce the behavior:

1. Open a localized URL
2. Ensure that locale cookie is set
3. Open an URL for the default language
4. Check Set-Cookie response header. It will be locale=deleted for the homepage or will contain the page slug for the other pages.

or

1. Use CURL to send a request to the URL for the default language with the locale cookie for the another language:

curl -b 'locale=fr' -I http://example.com

2. Check SetCookie response header:

Set-Cookie: locale=deleted; expires=Fri, 29-Mar-2019 18:03:28 GMT; Max-Age=0; path=/; httponly

Expected behavior
locale cookie must be preserved

More info:

• Version of Laravel: 5.5
• Version of the Laravel-localization package: 1.5
• Which middleware is used in Route::groups: LocaleCookieRedirect, LaravelLocalizationRedirectFilter
• Copy of the config file:

<?php

return [
    'supportedLocales' => [
        'de'          => ['name' => 'German',                 'script' => 'Latn', 'native' => 'Deutsch', 'regional' => 'de_DE', 'comprehensible' => ['de-de', 'de']],
        'en'          => ['name' => 'English',                'script' => 'Latn', 'native' => 'English', 'regional' => 'en_US', 'comprehensible' => ['en-gb', 'en-us', 'en']],
        'fr'          => ['name' => 'French',                 'script' => 'Latn', 'native' => 'Français', 'regional' => 'fr_FR', 'comprehensible' => ['fr-fr', 'fr']],
        'pt-br'       => ['name' => 'Brazilian Portuguese',   'script' => 'Latn', 'native' => 'Português do Brasil', 'regional' => 'pt_BR', 'comprehensible' => ['pt-BR', 'pt']],
        'es'          => ['name' => 'Spanish',                'script' => 'Latn', 'native' => 'Español', 'regional' => 'es_ES', 'comprehensible' => ['es_ES','es']],
        'it'          => ['name' => 'Italian',                'script' => 'Latn', 'native' => 'Italiano', 'regional' => 'it_IT', 'comprehensible' => ['it', 'it_IT']],
        'ru'          => ['name' => 'Russian',                'script' => 'Cyrl', 'native' => 'Pусский', 'regional' => 'ru_RU', 'comprehensible' => ['ru_RU', 'ru']],
    ],
    'useAcceptLanguageHeader' => true,
    'hideDefaultLocaleInURL' => true,
];

Additional context
This issue does not break the site behavior because after the redirect we got a locale in the URL and LocaleCookieRedirect middleware is set the correct locale to the cookies again.

Probably the issue is caused by this line. We should use no params[0], but $locale variable as the cookie value.