Update servant_names.json

Author: IVoyagerII

app/data/mappings/servant_names.json

@@ -522,5 +522,5 @@
   "河上彦斎": "Kawakami Gensai",
   "藤堂平助": "Tōdō Heisuke",
   "原田左之助": "Harada Sanosuke",
-  "近藤勇": "近藤勇"
+  "近藤勇": "Kondo Isami"
 }