[PLT-6969] System console setting for the emoji picker (#6809)

* system console setting for the emoji picker

* remove state.emojiPickerEnable

* update url to /admin_console/customization/emoji

config/config.json

@@ -38,6 +38,7 @@
         "WebsocketPort": 80,
         "WebserverMode": "gzip",
         "EnableCustomEmoji": false,
+        "EnableEmojiPicker": false,
         "RestrictCustomEmojiCreation": "all",
         "RestrictPostDelete": "all",
         "AllowEditPost": "always",