don't save tesla settings into db

lib/pleroma/config/loader.ex

@@ -12,6 +12,11 @@ defmodule Pleroma.Config.Loader do
     :swarm
   ]
 
+  @reject_groups [
+    :postgrex,
+    :tesla
+  ]
+
   if Code.ensure_loaded?(Config.Reader) do
     @reader Config.Reader
 
@@ -47,7 +52,8 @@ defmodule Pleroma.Config.Loader do
   @spec filter_group(atom(), keyword()) :: keyword()
   def filter_group(group, configs) do
     Enum.reject(configs[group], fn {key, _v} ->
-      key in @reject_keys or (group == :phoenix and key == :serve_endpoints) or group == :postgrex
+      key in @reject_keys or group in @reject_groups or
+        (group == :phoenix and key == :serve_endpoints)
     end)
   end
 end