Update jellyfin.sh

Set v22.04 as default

ct/jellyfin.sh

@@ -24,7 +24,7 @@ var_disk="8"
 var_cpu="2"
 var_ram="2048"
 var_os="ubuntu"
-var_version="20.04"
+var_version="22.04"
 variables
 color
 catch_errors