support the open-icon of folder (#34168) (#34896)

Backport #34168 by @kerwin612

Co-authored-by: Kerwin Bryant <kerwin612@qq.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/repo/diff/box.tmpl

@@ -60,6 +60,7 @@
 	{{end}}
 	<div id="diff-container">
 		{{if $showFileTree}}
+			{{$.FileIconPoolHTML}}
 			<div id="diff-file-tree" class="tw-hidden not-mobile"></div>
 			<script>
 				if (diffTreeVisible) document.getElementById('diff-file-tree').classList.remove('tw-hidden');

templates/repo/view_list.tmpl

@@ -4,12 +4,12 @@
 		{{template "repo/latest_commit" .}}
 		<div>{{if and .LatestCommit .LatestCommit.Committer}}{{DateUtils.TimeSince .LatestCommit.Committer.When}}{{end}}</div>
 	</div>
+	{{$.FileIconPoolHTML}}
 	{{if .HasParentPath}}
 	<a class="repo-file-line parent-link silenced" href="{{.BranchLink}}{{if .ParentPath}}{{PathEscapeSegments .ParentPath}}{{end}}">
-		{{svg "octicon-file-directory-fill"}} ..
+		{{index $.FileIcons ".."}} ..
 	</a>
 	{{end}}
-	{{$.FileIconPoolHTML}}
 	{{range $item := .Files}}
 		<div class="repo-file-item">
 			{{$entry := $item.Entry}}