atom keys with leading :

lib/mix/tasks/pleroma/config.ex

@@ -59,11 +59,11 @@ defmodule Mix.Tasks.Pleroma.Config do
              do: ",",
              else: ":"
 
+        key = String.trim_leading(config.key, ":")
+
         IO.write(
           file,
-          "config :#{config.group}, #{config.key}#{mark} #{
-            inspect(Config.from_binary(config.value))
-          }\r\n"
+          "config :#{config.group}, #{key}#{mark} #{inspect(Config.from_binary(config.value))}\r\n"
         )
 
         if delete? do

lib/pleroma/config/transfer_task.ex

@@ -35,7 +35,7 @@ defmodule Pleroma.Config.TransferTask do
         if String.starts_with?(setting.key, "Pleroma.") do
           "Elixir." <> setting.key
         else
-          setting.key
+          String.trim_leading(setting.key, ":")
         end
 
       group = String.to_existing_atom(setting.group)