Fix #7873: Skip old reddit redirect when loading new reddit media page

[kylehickinson]

i.redd.it/{id} now redirects to a new media viewer page instead of viewing the content directly, and that media page is located at reddit.com/media?url={iredditurl}. If we attempt to redirect this URL to old.reddit.com, it will be treated as a post lookup instead of the media viewer, and end up on a random /r/funny post from years ago

Summary of Changes

This pull request fixes #7873

Submitter Checklist:

• Unit Tests are updated to cover new or changed functionality
• User-facing strings use NSLocalizableString()
• New or updated UI has been tested across:
  • Light & dark mode
  • Different size classes (iPhone, landscape, iPad)
  • Different dynamic type sizes

Reviewer Checklist:

• Issues include necessary QA labels:
  • QA/(Yes|No)
  • bug / enhancement
• Necessary security reviews have taken place.
• Adequate unit test coverage exists to prevent regressions.
• Adequate test plan exists for QA to validate (if applicable).
• Issue and pull request is assigned to a milestone (should happen at merge time).

[iccub]

thank you