update: set zsh as default in calamares intaller

base/airootfs/etc/calamares/modules/users.conf

@@ -143,7 +143,7 @@ allowWeakPasswordsDefault: false
 #    and rely on a correct configuration file in /etc/default/useradd
 #  - set, non-empty, use that path as shell. No validation is done
 #    that the shell actually exists or is executable.
-userShell: /bin/bash
+userShell: /bin/zsh
 
 # Hostname setting
 #