fix up minor template bug

templates/index.html

@@ -26,7 +26,7 @@
 		<!-- Base theme -->
 		<link rel="stylesheet" id="style" href="{{.URL.Parse "/css/main.css"}}?v=2">
 		<!-- User selected theme, if any -->
-		{{if $.Theme}}<link rel="stylesheet" id="theme" href="/css/{{$.Theme}}.css">{{end}}
+		{{if .Theme}}<link rel="stylesheet" id="theme" href="/css/{{$.Theme}}.css">{{end}}
       
 		<!-- Search Box for Google -->
 		<script type="application/ld+json">{"@context":"https://schema.org","@type":"WebSite","url":"https://nyaa.pantsu.cat/","potentialAction":{"@type":"SearchAction","target":"https://nyaa.pantsu.cat/search?q={search_term_string}","query-input":"required name=search_term_string"}}</script>