Fixed admin user not showing in download all activity report

[snipe]

This fixes the regression where the admin user's name was being omitted from the Activity Report > Download All, reported via Discord.

[what-the-diff]

PR Summary

• Improving Data Fetching Efficiency - The Actionlog model now includes 'adminuser' in its eager loading mechanism. This change helps to reduce the amount of queries required when using the Actionlog model, which can improve overall system performance.
• Update in Data Access Method - Revised the way we access specific data from the Actionlog. Previously, we used $actionlog->admin to retrieve the full name attribute for action logs. We've updated this to now use $actionlog->adminuser. This aligns with the new way we load data, ensuring a smoother, more efficient access to the data we require.