Fix 404 when accessing web UI with the prefix, but without ending /

Thanks, txtsd

src/HTTPSock.cpp

@@ -225,6 +225,9 @@ void CHTTPSock::GetPage() {
 		DEBUG("Expected prefix:   " << m_sURIPrefix);
 		DEBUG("Requested path:    " << m_sURI);
 		Redirect("/");
+	} else if (m_sURI.empty()) {
+		// This can happen if prefix was /foo, and the requested page is /foo
+		Redirect("/");
 	} else {
 		OnPageRequest(m_sURI);
 	}