[XFSkins] Online Activity URL 1.0.3

This update fixes an Undefined property: XF\Entity\SessionActivity::$description warning that could appear in some environments. Unknown online activity entries should now be processed more reliably and cleanly.

Changes in this version:

• Made SessionActivity description checks safer
• Fixed a template warning that could appear in some environments
• Improved overall stability

Changes in this version:

• Improved compatibility for fresh installations
• Improved upgrade stability for existing installations
• Added safer schema handling during install and upgrade
• Fixed a prepared statement mismatch issue that could appear in some environments