fix(furaffinity): detected non-tag elements as tags when logged in

when logged in there are "block tag" elements, which are empty, but
still get recognized as tags.

example element, which was previously detected:
```
<a class="tag-block add-tag" href="javascript:void(0);" data-tag-name="cute" title="Click to add this tag to the blocklist!"></a>
```
(the text gets filled via `::after`, so it is empty)

src/engines/FurAffinity.ts

@@ -47,7 +47,7 @@ export default class FurAffinity extends ScrapeEngineBase {
       }
 
     // Set tags
-    post.tags = Array.from(document.querySelectorAll("section.tags-row > span.tags a"))
+    post.tags = Array.from(document.querySelectorAll("section.tags-row > span.tags a:not(.tag-block)"))
       .map((x) => (x as HTMLSpanElement).innerText)
       .map((x) => new ScrapedTag(x));