fix: skip Matomo tracking on all localhost subdomains (#184)

## Summary

- Use `endsWith("localhost")` instead of `!== "localhost"` in the Matomo
guard so tracking is also skipped on `*.localhost` subdomains (e.g.
`myapp.localhost`), which browsers treat as local
- Aligns with the same fix applied in dfinity/icp-cli#538

## Sync recommendation

hand-written

Author: marc0olo

public/matomo.js

@@ -1,4 +1,4 @@
-if (location.hostname !== "localhost" && location.hostname !== "127.0.0.1") {
+if (!location.hostname.endsWith("localhost") && location.hostname !== "127.0.0.1") {
   var _paq = (window._paq = window._paq || []);
   _paq.push(["disableCookies"]);
   _paq.push(["enableLinkTracking"]);