[belazon] fix starting from a specific page

with the default '"order-posts": "desc"'

gallery_dl/extractor/bellazon.py

@@ -114,7 +114,7 @@ class BellazonExtractor(Extractor):
     def _pagination_reverse(self, base, pnum=None):
         base = f"{self.root}{base}"
 
-        url = f"{base}/page/9999/"  # force redirect to highest page number
+        url = f"{base}/page/{'9999' if pnum is None else pnum}/"
         with self.request(url) as response:
             parts = response.url.rsplit("/", 3)
             pnum = text.parse_int(parts[2]) if parts[1] == "page" else 1