[mangatown] fix & update

- use BASE_PATTERN
- fix manga, manga_id, chapter_id extraction
- fix & extend 'manga' metadata results
- extend test results

test/results/mangatown.py

@@ -10,36 +10,54 @@ from gallery_dl.extractor import mangatown
 __tests__ = (
 {
     "#url"     : "https://www.mangatown.com/manga/kimetsu_no_yaiba/c001/",
-    "#category": ("", "mangatown", "chapter"),
     "#class"   : mangatown.MangatownChapterExtractor,
     "#pattern" : r"https://zjcdn\.mangahere\.org/.*",
     "#count"   : ">= 20",
+
+    "chapter"      : 1,
+    "chapter_id"   : 368511,
+    "chapter_minor": "",
+    "count"        : 55,
+    "page"         : range(1, 55),
+    "extension"    : "jpg",
+    "filename"     : str,
+    "lang"         : "en",
+    "language"     : "English",
+    "manga"        : "Kimetsu no Yaiba",
+    "manga_id"     : 21437,
+    "volume"       : 0,
+
 },
 
 {
     "#url"     : "https://www.mangatown.com/manga/kimetsu_no_yaiba/c001/1.html",
-    "#category": ("", "mangatown", "chapter"),
     "#class"   : mangatown.MangatownChapterExtractor,
     "#pattern" : r"https://zjcdn\.mangahere\.org/.*",
 },
 
 {
     "#url"     : "http://www.mangatown.com/manga/kimetsu_no_yaiba/c001/",
-    "#category": ("", "mangatown", "chapter"),
     "#class"   : mangatown.MangatownChapterExtractor,
 },
 
 {
     "#url"     : "https://www.mangatown.com/manga/kimetsu_no_yaiba/",
-    "#category": ("", "mangatown", "manga"),
     "#class"   : mangatown.MangatownMangaExtractor,
     "#pattern" : mangatown.MangatownChapterExtractor.pattern,
     "#count"   : ">= 100",
+
+    "chapter"  : int,
+    "chapter_minor": {"", ".5", ".6"},
+    "date"     : str,
+    "lang"     : "en",
+    "language" : "English",
+    "manga"    : "Kimetsu no Yaiba",
+    "title"    : str,
+
 },
 
 {
     "#url"     : "http://www.mangatown.com/manga/kimetsu_no_yaiba/",
-    "#category": ("", "mangatown", "manga"),
     "#class"   : mangatown.MangatownMangaExtractor,
 },