Recently Updated macro: improvements to layout #148

Preconditions: Have a page with the Recently Updated Macro added with default selections.

Steps to reproduce:

1. Edit the page with the Recently Updated Macro
2. Select ShowProfilePic
3. Submit
4. Save & View the page
5. Edit again
6. Under Theme add "social" to group by user
7. Submit
8. Save & View

Actual results:

1. The Profile Pic should have the same dimensions for all users.
2. In case of the social grouping the spacing between the results isn't consistent - some are narrow.

Environment: Windows 11, XWiki 14.10.10 with MySQL 8.0 and Chrome 114, Pro Macros 1.9