simplify extractor constants

- single strings for URL patterns
- tuples instead of lists for 'directory_fmt' and 'test'
- single-tuple tests where applicable

gallery_dl/extractor/ngomik.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2018 Mike Fährmann
+# Copyright 2018-2019 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -16,13 +16,13 @@ class NgomikChapterExtractor(ChapterExtractor):
     """Extractor for manga-chapters from ngomik.in"""
     category = "ngomik"
     root = "http://ngomik.in"
-    pattern = [r"(?:https?://)?(?:www\.)?ngomik\.in"
-               r"/manga/([^/?&#]+/chapter-[^/?&#]+)"]
-    test = [(("http://ngomik.in/manga/chuuko-demo-koi-ga-shitai"
-              "/chapter-21-5?style=list"), {
+    pattern = (r"(?:https?://)?(?:www\.)?ngomik\.in"
+               r"/manga/([^/?&#]+/chapter-[^/?&#]+)")
+    test = (("http://ngomik.in/manga/chuuko-demo-koi-ga-shitai"
+             "/chapter-21-5?style=list"), {
         "url": "e87ed713f31d576013f179b50b4e10d7c678e53a",
         "keyword": "a774caea148fc18a7d889f453dadbe3def9e0c2c",
-    })]
+    })
 
     def __init__(self, match):
         url = "{}/manga/{}?style=list".format(self.root, match.group(1))