update mohist download script to use new API endpoint

[WaveringAna]

Fixes #3246
Tested on my end to work

% docker run -it -p 25565:25565 -e EULA=TRUE -e TYPE=MOHIST -e VERSION=1.20.1 -e MOHIST_BUILD=922 ana/minecraft-server
[init] Running as uid=1000 gid=1000 with /data as 'drwxr-x--- 2 1000 1000 4096 Jan 12 10:31 /data'
[init] Resolving type given MOHIST
[init] Resolved version given 1.20.1 into 1.20.1
[init] Downloading Mohist build 922 for 1.20.1
[init] Creating server properties in /data/server.properties
[init] Disabling whitelist functionality
[mc-image-helper] 10:33:54.686 INFO  : Created/updated 4 properties in /data/server.properties
[init] Setting initial memory to 1G and max to 1G
[init] Starting the Minecraft server...
File init exception!

 ███╗   ███╗  ██████╗  ██╗  ██╗ ██╗ ███████╗ ████████╗
 ████╗ ████║ ██╔═══██╗ ██║  ██║ ██║ ██╔════╝ ╚══██╔══╝
 ██╔████╔██║ ██║   ██║ ███████║ ██║ ███████╗    ██║
 ██║╚██╔╝██║ ██║   ██║ ██╔══██║ ██║ ╚════██║    ██║
 ██║ ╚═╝ ██║ ╚██████╔╝ ██║  ██║ ██║ ███████║    ██║
 ╚═╝     ╚═╝  ╚═════╝  ╚═╝  ╚═╝ ╚═╝ ╚══════╝    ╚═╝

[itzg]

Thanks for the quick fix!

[itzg]

I'll merge after the PR test run.