Platform icons are not updated on posts page
### Describe the bug
When Platform icons are updated, cache is emptied everywhere except on `/@handle/posts/guid` pages.
### Steps to reproduce
1. Go to a comment page
2. update a platform (podcast, social on funding)
3. Go back to the comment page: platforms are not updated
4. Empty cache
5. Go back to the comment page: platforms are updated
### Expected behavior
Plateform icons should be updated
### Actual behavior
Plateform icons are not updated
### Relevant logs and/or screenshots
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### Context
- Castopod: beta-8
- OS: Debian 10
- Browser: n/a
- Web server: nginx
### Possible fixes
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issue