Adjust to new Template::getPage() returning value, not reference

handlers/handlerallcategories.cpp

@@ -32,7 +32,7 @@ Response HandlerAllCategories::handleRequest(const Request &r)
 			"No categories",
 			"This wiki does not have any categories defined yet or your query options did not yield any results");
 	}
-	TemplatePage &searchPage = this->templ->getPage("allcategories");
+	TemplatePage searchPage = this->templ->getPage("allcategories");
 	std::string body =
 		this->templ->renderSearch(resultList, [&](std::string str) { return this->urlProvider->category(str); });
 	searchPage.setVar("categorylist", body);