Use already set preferences variable

Author: Fijxu

src/invidious/views/components/search_box.ecr

@@ -1,5 +1,5 @@
 <%
-	search_privacy = env.get("preferences").as(Preferences).search_privacy
+	search_privacy = preferences.search_privacy
 %>
 
 <% if search_privacy %>

src/invidious/views/search.ecr

@@ -1,5 +1,5 @@
 <%
-	search_privacy = env.get("preferences").as(Preferences).search_privacy
+    search_privacy = preferences.search_privacy
     search_query = query.text.size > 30 ? HTML.escape(query.text[0,30].rstrip(".")) + "&hellip;" : HTML.escape(query.text)
 %>