Update app.py

[Suspectxyzz]

It is now easier to update 'mapNameVal'

[therewillwhile]

I'm not at home now, so i can't check workability of this. I'll update this offsets but I'm not sure, that app will work and how the new mapnameval from cs2dumper works. I always search it with cheat engine

[Suspectxyzz]

I tested it now everything works @meanwhiletothestars ,I asked the creator to add this offset mapNameVal and it works

[therewillwhile]

thx, I'll do the automatic offset update and websocket in a few days