create alias megami_paradise -> megami_tengoku

Link to alias

For search sake

To be honest I'm not 100% sure if this should be this way, because I'm seeing english title as subtitle even in pure japanese materials.
Anyway, it's an old series so it shouldn't matter too much.

Every Japanese source I see specifies the reading as "paradise", so I guess it's like topic #11946

Toks is correct, so I've reversed the alias.

The tag alias megami_tengoku -> megami_paradise has been approved.