fix repo trash button (#6254)

* fix repo trash button

* optimize code

---------

Co-authored-by: 孙永强 <11704063+s-yongqiang@user.noreply.gitee.com>

frontend/src/repo-folder-trash.js

@@ -21,7 +21,8 @@ const {
   repoID,
   repoFolderName,
   path,
-  enableClean
+  enableClean,
+  isRepoAdmin
 } = window.app.pageOptions;
 
 class RepoFolderTrash extends React.Component {
@@ -203,7 +204,7 @@ class RepoFolderTrash extends React.Component {
                 </a>
                 <div className="d-flex justify-content-between align-items-center op-bar">
                   <p className="m-0 text-truncate d-flex"><span className="mr-1">{gettext('Current path: ')}</span>{showFolder ? this.renderFolderPath() : <span className="text-truncate" title={repoFolderName}>{repoFolderName}</span>}</p>
-                  {(path == '/' && enableClean && !showFolder) &&
+                  {(path == '/' && enableClean && !showFolder && isRepoAdmin) &&
                   <button className="btn btn-secondary clean flex-shrink-0 ml-4" onClick={this.cleanTrash}>{gettext('Clean')}</button>
                   }
                 </div>