Remove unnecessary SanitizeHTML from code (#29575)

* "mail/issue/default.tmpl": the body is rendered by backend
`markdown.RenderString() HTML`, it has been already sanitized
* "repo/settings/webhook/base_list.tmpl": "Description" is prepared by
backend `ctx.Tr`, it doesn't need to be sanitized

templates/mail/issue/default.tmpl

@@ -58,7 +58,7 @@
 				{{.locale.Tr "mail.issue.action.new" .Doer.Name .Issue.Index}}
 			{{end}}
 		{{else}}
-			{{.Body | SanitizeHTML}}
+			{{.Body}}
 		{{end -}}
 		{{- range .ReviewComments}}
 			<hr>

templates/repo/settings/webhook/base_list.tmpl

@@ -10,7 +10,7 @@
 <div class="ui attached segment">
 	<div class="ui list">
 		<div class="item">
-			{{.Description | SanitizeHTML}}
+			{{.Description}}
 		</div>
 		{{range .Webhooks}}
 			<div class="item truncated-item-container">

templates/status/500.tmpl

@@ -1,5 +1,5 @@
 {{/* This page should only depend the minimal template functions/variables, to avoid triggering new panics.
-* base template functions: AppName, AssetUrlPrefix, AssetVersion, AppSubUrl, ThemeName, SanitizeHTML
+* base template functions: AppName, AssetUrlPrefix, AssetVersion, AppSubUrl, ThemeName
 * ctx.Locale
 * .Flash
 * .ErrorMsg