[batoto] return 'chapter_url' as string (#5562)

don't try to parse it as integer

test/results/batoto.py

@@ -17,7 +17,7 @@ __tests__ = (
     "chapter"      : 8,
     "chapter_id"   : 1681030,
     "chapter_minor": "",
-    "chapter_url"  : 8,
+    "chapter_url"  : "8",
     "count"        : 66,
     "date"         : "dt:2021-05-15 18:51:37",
     "extension"    : "webp",
@@ -52,7 +52,7 @@ __tests__ = (
     "chapter"   : 9,
     "chapter_id": 2584460,
     "chapter_minor": "",
-    "chapter_url": 9,
+    "chapter_url": "9",
     "count"     : 18,
     "date"      : "dt:2023-11-26 11:01:12",
     "manga"     : "Isekai Teni shitara Aiken ga Saikyou ni narimashita - Silver Fenrir to Ore ga Isekai Kurashi wo Hajimetara (Official)",
@@ -70,7 +70,7 @@ __tests__ = (
     "chapter"      : 76,
     "chapter_id"   : 2089747,
     "chapter_minor": "",
-    "chapter_url"  : 76,
+    "chapter_url"  : "76",
     "title"        : "Side Story 4 [END]",
 },
 
@@ -83,7 +83,7 @@ __tests__ = (
     "chapter_id"    : 2631897,
     "chapter_minor" : "",
     "chapter_string": "S1 Episode 37 (End of season)",
-    "chapter_url"   : 38,
+    "chapter_url"   : "38",
     "count"         : 69,
     "date"          : "dt:2023-12-20 17:31:18",
     "manga"         : "Today With You",