Skip cache when /objects or /activities is authenticated

Ref: fix-local-public

lib/pleroma/web/plugs/cache.ex

@@ -100,17 +100,18 @@ defp cache_resp(conn, opts) do
         should_cache = not Map.get(conn.assigns, :skip_cache, false)
 
         conn =
-          cond do
-            Map.get(conn.assigns, :skip_cache, false) ->
-              conn
-
-            !opts[:tracking_fun] ->
+          unless opts[:tracking_fun] do
+            if should_cache do
               @cachex.put(:web_resp_cache, key, {content_type, body}, ttl: ttl)
-              conn
+            end
 
-            true ->
+            conn
+          else
             tracking_fun_data = Map.get(conn.assigns, :tracking_fun_data, nil)
+
+            if should_cache do
               @cachex.put(:web_resp_cache, key, {content_type, body, tracking_fun_data}, ttl: ttl)
+            end
 
             opts.tracking_fun.(conn, tracking_fun_data)
           end