[GOG]: ignore port provided in adtraction url

[imLinguin]

Fixes fallback issues introduced after recent changes in how GOG does redirects

Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[CommandMC]

This is a fine fix, but part of me wonders why GOG does this and whether the "better" solution might just be bugging them about it