Update customMaps.js and manageMapFiles.js

[redd-rl]

hacky fix attempt at fixing the extremely common problem of "Error invoking remote method 'updatemapsfromdirectory: syntax error: Unexpected string in JSON at position 43" because leth forgot how to json with the Aerial Training Remastered map and blatantly ignored users telling him about it. that error results in the map loader being softlocked until the user figures out that it's because of aerial training remastered and gets rid of it.

[NoxPhoenix]

I will merge this alongside another quick fix this week and post the new build.

[redd-rl]

changed the filesize because it's changed apparently. 2575186

[redd-rl]

🤗

[redd-rl]