refactor: unify command declaration across codebase

plugins/domains/subcommands/default

@@ -6,8 +6,9 @@ source "$PLUGIN_AVAILABLE_PATH/domains/functions"
 
 cmd-domains-default() {
   declare desc="print app domains"
-  local cmd="domains"
-  local APP="$2"
+  declare cmd="domains"
+  [[ "$1" == "$cmd" ]] && shift 1
+  declare APP="$1"
 
   dokku_log_warn "Deprecated: Please use domains:report"
   if [[ "$(is_global_vhost_enabled)" == "true" ]]; then