HandlerPageView: Use revision from db, not query param, as template value.

Not a vulnerability, but more correct this way.

handlers/handlerpageview.cpp

@@ -162,19 +162,20 @@ Response HandlerPageView::handleRequest(PageDao &pageDao, std::string pagename,
 			this->cache->put(cachekeyparsedcontent, parsedcontent);
 		}
 	}
+	std::string revisionstr = std::to_string(revision->revision);
 	page.setVar("content", parsedcontent);
 	page.setVar("index", indexcontent);
 	page.setVar("editedby", revision->author);
 	page.setVar("editedon", utils::toISODate(revision->timestamp));
 	page.setVar("historyurl", this->urlProvider->pageHistory(pagename));
-	page.setVar("revision", revisionparam);
+	page.setVar("revision", revisionstr);
 	setPageVars(page, pagename);
 	std::string body = page.render();
 	if(revisionid == 0 && !this->userSession->loggedIn)
 	{
 		this->cache->put("page:foranon:" + pagename, body);
 	}
-	result.addHeader("ETAG", std::to_string(revision->revision) + "+" + std::to_string(this->userSession->loggedIn));
+	result.addHeader("ETAG", revisionstr + "+" + std::to_string(this->userSession->loggedIn));
 	result.setBody(body);
 	return result;
 }