Fix gniza remote list failing when main config doesn't exist

remote list only reads remotes.d/ — no need to load gniza.conf.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bin/gniza

@@ -859,9 +859,6 @@ cmd_remote() {
 
     case "$subcommand" in
         list|ls|"")
-            local config_file; config_file=$(get_opt config "$@" 2>/dev/null) || config_file="$DEFAULT_CONFIG_FILE"
-            load_config "$config_file"
-
             if ! has_remotes; then
                 echo "No remotes configured."
                 echo "Run 'gniza init remote <name>' to add one."