Make test.exs read config in the same way as dev.exs

This way, if your test.secret.exs has an error, you'll actually see it.

config/test.exs

@@ -82,10 +82,9 @@
 
 config :pleroma, Pleroma.ReverseProxy.Client, Pleroma.ReverseProxy.ClientMock
 
-try do
+if File.exists?("./config/test.secret.exs") do
   import_config "test.secret.exs"
-rescue
-  _ ->
+else
   IO.puts(
     "You may want to create test.secret.exs to declare custom database connection parameters."
   )