fix: upgrade 2.1.1 file

[ga-devfront]

Questions	Answers
Description?	This may seem silly, but having a line before the PhP tag is sometimes poorly managed by module upgrades. We can therefore end up with an error like this:PHP Fatal error: Uncaught RuntimeException: Failed to start the session because headers have already been sent by "/var/www/html/modules/ps_wirepayment/upgrade/upgrade-2.1.1.php" at line 1. in /var/www/html/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/Session/Storage/NativeSessionStorage.php:150
Type?	bug fix
BC breaks?	no
Deprecations?	no
How to test?	You can try update then this PR is merged and another zip is created

[ps-jarvis]

Hello @ga-devfront!

This is your first pull request on ps_wirepayment repository of the PrestaShop project.

Thank you, and welcome to this Open Source community!

[boherm]

Nice! Thanks @ga-devfront!

[Hlavtox]

@ga-devfront Good find, I made a quick search now... :D

pagesnotfound\upgrade\upgrade-2.0.2.php
ps_wirepayment\upgrade\upgrade-2.1.1.php
statsbestcategories\upgrade\upgrade-2.0.1.php
statsbestcustomers\upgrade\upgrade-2.0.4.php
statsbestmanufacturers\upgrade\upgrade-2.0.1.php
statsbestproducts\upgrade\upgrade-2.0.1.php
statsbestsuppliers\upgrade\upgrade-2.0.1.php
statsbestvouchers\upgrade\upgrade-2.0.1.php
statscarrier\upgrade\upgrade-2.0.1.php
statscatalog\upgrade\upgrade-2.0.2.php
statsforecast\upgrade\upgrade-2.0.4.php
statscheckup\upgrade\upgrade-2.0.2.php
statsnewsletter\upgrade\upgrade-2.0.3.php
statspersonalinfos\upgrade\upgrade-2.0.4.php
statsproduct\upgrade\upgrade-2.1.1.php
statsregistrations\upgrade\upgrade-2.0.1.php
statssales\upgrade\upgrade-2.1.0.php
statssearch\upgrade\upgrade-2.0.2.php
statsstock\upgrade\upgrade-2.0.1.php