Admin: Fix invalid link redirects

[MythicManiac]

Fix the "View on site" links for both Package and PackageListing models, as both were linking to the wrong URL

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (5ffb1bc) 92.19% compared to head (c9262f7) 92.16%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #880 +/- ## ========================================== - Coverage 92.19% 92.16% -0.04% ========================================== Files 268 268 Lines 7689 7694 +5 Branches 731 732 +1 ========================================== + Hits 7089 7091 +2 - Misses 498 501 +3 Partials 102 102 ``` | [Files](https://app.codecov.io/gh/thunderstore-io/Thunderstore/pull/880?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=thunderstore-io) | Coverage Δ | | |---|---|---| | [django/thunderstore/repository/models/package.py](https://app.codecov.io/gh/thunderstore-io/Thunderstore/pull/880?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=thunderstore-io#diff-ZGphbmdvL3RodW5kZXJzdG9yZS9yZXBvc2l0b3J5L21vZGVscy9wYWNrYWdlLnB5) | `97.72% <100.00%> (ø)` | | | [...go/thunderstore/community/admin/package\_listing.py](https://app.codecov.io/gh/thunderstore-io/Thunderstore/pull/880?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=thunderstore-io#diff-ZGphbmdvL3RodW5kZXJzdG9yZS9jb21tdW5pdHkvYWRtaW4vcGFja2FnZV9saXN0aW5nLnB5) | `92.30% <40.00%> (-7.70%)` | :arrow_down: |

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