[furaffinity] add 'layout' option (#2277)

to be able to force gallery-dl to parse according to a specific layout
in case its auto-detect fails

gallery_dl/extractor/furaffinity.py

@@ -28,11 +28,16 @@ class FuraffinityExtractor(Extractor):
         Extractor.__init__(self, match)
         self.user = match.group(1)
         self.offset = 0
-        self._new_layout = None
 
         if self.config("descriptions") == "html":
             self._process_description = str.strip
 
+        layout = self.config("layout")
+        if layout and layout != "auto":
+            self._new_layout = False if layout == "old" else True
+        else:
+            self._new_layout = None
+
     def items(self):
 
         if self._warning: