sci-mathematics/rkward: remove unused patch(es)

Signed-off-by: Michael Mair-Keimberger <mm1ke@gentoo.org>

sci-mathematics/rkward/files/rkward-0.8.2-missing-header.patch

@@ -1,24 +0,0 @@
-From 02e95931485e610ed8e41e5dbf791a3b8fab8210 Mon Sep 17 00:00:00 2001
-From: Thomas Friedrichsmeier <thomas.friedrichsmeier@kdemail.net>
-Date: Sun, 12 Oct 2025 22:08:22 +0200
-Subject: [PATCH] Add missing include
-
----
- rkward/autotests/core_test.cpp | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/rkward/autotests/core_test.cpp b/rkward/autotests/core_test.cpp
-index 1345dfd81..76e4091d8 100644
---- a/rkward/autotests/core_test.cpp
-+++ b/rkward/autotests/core_test.cpp
-@@ -9,6 +9,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
- #include <QApplication>
- #include <QButtonGroup>
- #include <QDir>
-+#include <QElapsedTimer>
- #include <QFile>
- #include <QLoggingCategory>
- #include <QObject>
--- 
-GitLab
-