update default gallery-dl.conf

docs/gallery-dl.conf

@@ -10,7 +10,7 @@
         "proxy": null,
         "skip": true,
 
-        "user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0",
+        "user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0",
         "retries": 4,
         "timeout": 30.0,
         "verify": true,
@@ -143,7 +143,7 @@
             "username": null,
             "password": null,
             "include": "posts",
-            "sleep-request": 5.0,
+            "sleep-request": 8.0,
             "videos": true
         },
         "khinsider":
@@ -218,8 +218,7 @@
             "id-min": "0",
             "id-max": "zik0zj",
             "recursion": 0,
-            "videos": true,
-            "user-agent": "Python:gallery-dl:0.8.4 (by /u/mikf1)"
+            "videos": true
         },
         "redgifs":
         {