Revert "Coin: add required zstd"

This reverts commit a77f474aba.
Zstd is now available in the provisioning.

Pick-to: 6.3 6.2
Change-Id: Id66a3a8797e0c893318974a6fe2dd4e032d563b4
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>

coin/module_config.yaml

@@ -105,7 +105,6 @@ instructions:
   - type: WriteFile
     fileContents: |
       #!/bin/bash -xe
-      sudo apt install zstd
 
       # make hostname unique for NFS
       sudo hostname $(hostname -s)-$(date +%s%N)