refactor: unify command declaration across codebase

plugins/domains/subcommands/remove-global

@@ -6,10 +6,11 @@ source "$PLUGIN_AVAILABLE_PATH/domains/functions"
 
 cmd-domains-remove-global() {
   declare desc="remove global domain names via command line"
-  local cmd="domains:remove-global"
-  [[ -z $2 ]] && dokku_log_fail "Please specify a domain name. Usage: dokku $1 <domain> [<domain> ...]"
+  declare cmd="domains:remove-global"
+  [[ "$1" == "$cmd" ]] && shift 1
+  declare DOMAIN_NAME="$1"
 
-  shift 1
+  [[ -z "$DOMAIN_NAME" ]] && dokku_log_fail "Please specify a domain name. Usage: dokku $1 <domain> [<domain> ...]"
   domains_remove_global "$@"
 }