[twitter] change some defaults

- 'retweets' option: true -> false
- 'quoted' option  : true -> false

  i.e. disable downloading tweets from other user's timelines by default

- search directory:
    '["{category}", "Search", "{search}"]' ->
    '["{category}", "{user[name]}"]'

  i.e. change it to the same as other twitter extractors (#1308)

docs/configuration.rst

@@ -1715,7 +1715,7 @@ extractor.twitter.quoted
 Type
     ``bool``
 Default
-    ``true``
+    ``false``
 Description
     Fetch media from quoted Tweets.
 
@@ -1735,7 +1735,7 @@ extractor.twitter.retweets
 Type
     ``bool``
 Default
-    ``true``
+    ``false``
 Description
     Fetch media from Retweets.