gallery-dl: update config for Pixiv oauth

home/.config/gallery-dl/config.json

@@ -14,15 +14,14 @@
     "skip": true,
     "user-agent": "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0",
     "pixiv": {
-      "filename": "{id}{num}.{extension}",
+      "filename": "{id}.{extension}",
       "directory": [
         "Pixiv",
-        "{user[username]}"
+        "{user[name]-user[id]}"
       ],
       "avatar": false,
       "ugoira": true,
-      "username": "",
-      "password": ""
+      "refresh-token": ""
     },
     "danbooru": {
       "ugoira": false