fix(blockit): Prevent php warnings

[Rushaway]

Description

• Uncommented and fixed the database query to get server data and prevent php warnings for $data
• Added null coalescing operator for hostname array access

Motivation and Context

PHP Warning: Undefined variable $sdata in /var/www/vhosts/nide.gg/bans.nide.gg/pages/admin.blockit.php on line 91;
PHP message: PHP Warning: Trying to access array offset on null in /var/www/vhosts/nide.gg/bans.nide.gg/pages/admin.blockit.php on line 91; 

But I wonder why @Hackmastr commented this part of the code in smart v5 changes.

How Has This Been Tested?

Applied fix and run the page with an url like bans.nide.gg/pages/admin.blockit.php?check=steam_0:1:802859631&type=1&length=60 and do not throw warnings anymore.

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.