Meta: Add Xexxa's name to the contributors list

Author: https://github.com/Xexxa
Commit: https://github.com/SerenityOS/serenity/commit/c53486b9cea
Pull-request: https://github.com/SerenityOS/serenity/pull/11863

README.md

@@ -152,7 +152,7 @@ Join our Discord server: [SerenityOS Discord](https://discord.gg/serenityos)
 * **Leon Albrecht** - [Hendiadyoin1](https://github.com/Hendiadyoin1)
 * **Tim Schumacher** - [timschumi](https://github.com/timschumi)
 * **Marcus Nilsson** - [metmo](https://github.com/metmo)
-* **Xexxa** - [Xexxa](https://github.com/Xexxa)
+* **Gegga Thor** - [Xexxa](https://github.com/Xexxa)
 * **kleines Filmröllchen** - [kleinesfilmroellchen](https://github.com/kleinesfilmroellchen)
 
 (And many more!) The people listed above have landed more than 100 commits in the project. :^)