[sankaku] fix pagination for user favorites (#106)

gallery_dl/extractor/myportfolio.py

@@ -89,7 +89,7 @@ class MyportfolioUserExtractor(Extractor):
     pattern = [BASE_PATTERN + r"/?$"]
     test = [
         ("https://hannahcosgrove.myportfolio.com/", {
-            "url": "2d394ed7726bdd60da07454a2ba2a08c641b6c80",
+            "url": "846814f50114e586adfe1fe809fe0da004f22b46",
         }),
         ("myportfolio:https://tooco.com.ar/", {
             "count": ">= 40",

gallery_dl/extractor/sankaku.py

@@ -225,8 +225,12 @@ class SankakuTagExtractor(SankakuExtractor):
                 return
             yield from ids
 
+            next_url = text.extract(page, 'next-page-url="/?', '"', pos)[0]
+            if next_url:
+                params["next"] = text.parse_query(next_url)["next"]
+            else:
+                params["next"] = text.parse_int(ids[-1]) - 1
             params["page"] = 2
-            params["next"] = text.parse_int(ids[-1]) - 1
 
 
 class SankakuPoolExtractor(SankakuExtractor):