remove duplicate zyrardow, update pathfinding refs

[atxw]

Hello 👋

first of all thanks for bringing us this great tool, very happy to use it to drive and dispatch on game!

Just a simple PR to remove duplicate post zyrardow added at two different times:

• by commit 24f48f1 as (non playable) post ZYR, historically added around Grodisk Mazowiecki, before Lodz route
• by commit fa95c16 as (playable) post ZR, as part of Lodz route new stations

choose to remove ZYR variant since I've found other resources referring to post as ZR in sources, like this one

EDR/frontend/src/config.ts

Line 73 in cf39a91

import ZR from "./images/posts/jpg/Zyrardow.jpg";

don't hesitate if you want have remarks or if you want me to update something else for it to get merged