Fix Indentation in UsersController

[Toreg87]

Description

The indentation in the update-function of the UsersController is partially wrong. Fix this to avoid confusion.

[what-the-diff]

PR Summary

• Improved Readability of Code: We have restructured the code in the update method of UsersController.php for a more clean and simplified look. This serves to make the code more understandable and manageable.
• Optimized Authorization Process: We made adjustments in how the system verifies if a user is a superuser. This now follows a more uniform pattern which offers stability and reduces chances of errors.
• Maintained Existing Functions: We ensured that the avatar images and session data management remain unaffected while enhancing the clarity of the code. This means you can continue to access these functionalities without any hiccups.
• Smooth User Experience: We improved the flow of operations around saving user data and routing users based on successful or failed actions. This ensures seamless interaction with the application, increasing user satisfaction.