fix file not found error when deleting custom plugins

Replaced the "delete_work_dir_file" API call with a "delete_plugin" action in the plugins API. This bypasses the dev container file browser conversion and directly uses the runtime's absolute path to securely remove custom plugins using the files.delete_dir utility.

webui/components/plugins/list/pluginListStore.js

@@ -163,9 +163,10 @@ const model = {
     }
 
     try {
-      const response = await api.callJsonApi("delete_work_dir_file", {
+      const response = await api.callJsonApi("plugins", {
+        action: "delete_plugin",
+        plugin_name: plugin.name,
         path: plugin.path,
-        currentPath: "/",
       });
       if (response?.error) {
         throw new Error(response.error);