plasma-workspace: remove patch merged upstream

pkgs/desktops/plasma-5/plasma-workspace/0003-startkde-unit-detection.patch

@@ -1,17 +0,0 @@
-diff --git a/startkde/startplasma.cpp b/startkde/startplasma.cpp
-index a17967b47..6e6141b48 100644
---- a/startkde/startplasma.cpp
-+++ b/startkde/startplasma.cpp
-@@ -431,7 +431,11 @@ bool hasSystemdService(const QString &serviceName)
-                                               QStringLiteral("/org/freedesktop/systemd1"),
-                                               QStringLiteral("org.freedesktop.systemd1.Manager"),
-                                               QStringLiteral("ListUnitFilesByPatterns"));
--    msg << QStringList({QStringLiteral("enabled"), QStringLiteral("static")}) << QStringList({serviceName});
-+    msg << QStringList({QStringLiteral("enabled"),
-+                        QStringLiteral("static"),
-+                        QStringLiteral("linked"),
-+                        QStringLiteral("linked-runtime")});
-+    msg << QStringList({serviceName});
-     QDBusReply<QList<QPair<QString, QString>>> reply = QDBusConnection::sessionBus().call(msg);
-     if (!reply.isValid()) {
-         return false;

pkgs/desktops/plasma-5/plasma-workspace/default.nix

@@ -52,7 +52,6 @@ mkDerivation {
   patches = [
     ./0001-startkde.patch
     ./0002-absolute-wallpaper-install-dir.patch
-    ./0003-startkde-unit-detection.patch
   ];
 
   # QT_INSTALL_BINS refers to qtbase, and qdbus is in qttools