Krzysztof Kotlarek 2ad4fc39b6
FIX: calculate page if page param is not given to TopicView (#10953)
Currently, when page param is not given to TopicView we calculate page for canonical_path, however, it is skipped for next_path.

We should use the same calculation to define page, so next page URL will be accurate. Currently if you [view source of meta post](view-source:https://meta.discourse.org/t/post-rate-limit-trigger-for-a-topic-thats-heating-up/98294/46) you will see:

```
<link rel="canonical" href="https://meta.discourse.org/t/post-rate-limit-trigger-for-a-topic-thats-heating-up/98294?page=3" />
<link rel="next" href="/t/post-rate-limit-trigger-for-a-topic-thats-heating-up/98294?page=2">
```
2020-10-19 17:11:49 +11:00
..