refactor(templates): remove ctxData from tmpl files, use ctx.RootData instead (#37567)

Sub-templates have direct access to `ctx.RootData` (the root data map),
so there is no need for callers to explicitly pass it as `ctxData` via `dict`.

Also fix #37569 by the way

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wxiaoguang <2114189+wxiaoguang@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/admin/hook_new.tmpl

@@ -1,4 +1,4 @@
-{{template "admin/layout_head" (dict "ctxData" . "pageClass" "admin settings new webhook")}}
+{{template "admin/layout_head" (dict "pageClass" "admin settings new webhook")}}
 	<div class="admin-setting-content">
 		{{$CustomHeaderTitle := ctx.Locale.Tr "admin.defaulthooks.update_webhook"}}
 		{{if .PageIsAdminDefaultHooksNew}}
@@ -8,6 +8,6 @@
 		{{else if .Webhook.IsSystemWebhook}}
 			{{$CustomHeaderTitle = ctx.Locale.Tr "admin.systemhooks.update_webhook"}}
 		{{end}}
-		{{template "webhook/new" (dict "ctxData" . "CustomHeaderTitle" $CustomHeaderTitle)}}
+		{{template "webhook/new" (dict "CustomHeaderTitle" $CustomHeaderTitle)}}
 	</div>
 {{template "admin/layout_footer" .}}