[openstreetmap/openstreetmap-website] Update piwik reference to matomo (Issue #3641)

[Paul Norman]

### URL

https://www.openstreetmap.org/

### How to reproduce the issue?

View osm on latest Chrome and look at the console

### Screenshot(s) or anything else?

```
application-9b067f1f07832467ec16f87d7135408be1b48a71f33c1bc886785c39842ca100.js:27 Refused to load the script 'https://piwik.openstreetmap.org/piwik.js' because it violates the following Content Security Policy directive: "script-src 'self' matomo.openstreetmap.org". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback.
```

-- 
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/3641
You are receiving this because you are subscribed to this thread.

Message ID: <openstreetmap/openstreetmap-website/issues/3641 at github.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/rails-dev/attachments/20220731/114e26dd/attachment.htm>