[twitter] always use '3' as 'search-stop' default (#8613)

https://github.com/mikf/gallery-dl/issues/8613#issuecomment-3626474518

docs/configuration.rst

@@ -6431,8 +6431,7 @@ extractor.twitter.search-stop
 Type
     ``integer``
 Default
-    * ``3`` if `search-pagination <extractor.twitter.search-pagination_>`__ is set to ``"cursor"``
-    * ``0`` otherwise
+    ``3``
 Description
     Number of empty search result batches
     to accept before stopping.

docs/gallery-dl.conf

@@ -886,7 +886,7 @@
             "search-limit": 20,
             "search-pagination": "cursor",
             "search-results"   : "latest",
-            "search-stop" : "auto",
+            "search-stop" : 3,
             "size"        : ["orig", "4096x4096", "large", "medium", "small"],
             "text-tweets" : false,
             "tweet-endpoint": "auto",

gallery_dl/extractor/twitter.py

@@ -1483,7 +1483,7 @@ class TwitterAPI():
 
         stop_tweets = cfg("search-stop")
         if stop_tweets is None or stop_tweets == "auto":
-            stop_tweets = 3 if update_variables is None else 0
+            stop_tweets = 3
 
         return self._pagination_tweets(
             endpoint, variables,