plasma5.plasma-workspace: Fix path to SDDM theme background image

pkgs/desktops/plasma-5/plasma-workspace/0001-startkde.patch

@@ -1,7 +1,7 @@
 From 1796822e4c97062b919a596ce13db68e2c46c7e8 Mon Sep 17 00:00:00 2001
 From: Thomas Tuegel <ttuegel@mailbox.org>
 Date: Tue, 28 Jan 2020 05:00:53 -0600
-Subject: [PATCH] startkde
+Subject: [PATCH 1/2] startkde
 
 ---
  startkde/startplasma-waylandsession.cpp |  2 +-

pkgs/desktops/plasma-5/plasma-workspace/0002-absolute-wallpaper-install-dir.patch

@@ -0,0 +1,22 @@
+From 7c6f939aea290bc3ec7629f26d02441d1d4bcb8a Mon Sep 17 00:00:00 2001
+From: Thomas Tuegel <ttuegel@mailbox.org>
+Date: Wed, 5 Feb 2020 05:03:11 -0600
+Subject: [PATCH 2/2] absolute-wallpaper-install-dir
+
+---
+ sddm-theme/theme.conf.cmake | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/sddm-theme/theme.conf.cmake b/sddm-theme/theme.conf.cmake
+index ea9a943..c8458ba 100644
+--- a/sddm-theme/theme.conf.cmake
++++ b/sddm-theme/theme.conf.cmake
+@@ -2,4 +2,4 @@
+ type=image
+ color=#1d99f3
+ fontSize=10
+-background=${CMAKE_INSTALL_PREFIX}/${WALLPAPER_INSTALL_DIR}/Next/contents/images/5120x2880.png
++background=${NIXPKGS_BREEZE_WALLPAPERS}/Next/contents/images/5120x2880.png
+-- 
+2.23.1
+

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

@@ -6,12 +6,12 @@
   coreutils, dbus, gnugrep, gnused, isocodes, libdbusmenu, libSM, libXcursor,
   libXtst, pam, wayland, xmessage, xprop, xrdb, xsetroot,
 
-  baloo, kactivities, kactivities-stats, kcmutils, kconfig, kcrash, kdbusaddons,
+  baloo, breeze-qt5, kactivities, kactivities-stats, kcmutils, kconfig, kcrash,
-  kdeclarative, kdelibs4support, kdesu, kglobalaccel, kidletime, kinit,
+  kdbusaddons, kdeclarative, kdelibs4support, kdesu, kglobalaccel, kidletime,
-  kjsembed, knewstuff, knotifyconfig, kpackage, kpeople, krunner, kscreenlocker,
+  kinit, kjsembed, knewstuff, knotifyconfig, kpackage, kpeople, krunner,
-  ktexteditor, ktextwidgets, kwallet, kwayland, kwin, kxmlrpcclient, libkscreen,
+  kscreenlocker, ktexteditor, ktextwidgets, kwallet, kwayland, kwin,
-  libksysguard, libqalculate, networkmanager-qt, phonon, plasma-framework,
+  kxmlrpcclient, libkscreen, libksysguard, libqalculate, networkmanager-qt,
-  prison, solid, kholidays, breeze-qt5,
+  phonon, plasma-framework, prison, solid, kholidays,
 
   qtgraphicaleffects, qtquickcontrols, qtquickcontrols2, qtscript, qttools,
   qtwayland, qtx11extras,
@@ -38,10 +38,16 @@ mkDerivation {
   propagatedUserEnvPkgs = [ qtgraphicaleffects ];
   outputs = [ "out" "dev" ];
 
+  cmakeFlags = [
+    ''-DNIXPKGS_BREEZE_WALLPAPERS=${getBin breeze-qt5}/share/wallpapers''
+  ];
+
   patches = [
     ./0001-startkde.patch
+    ./0002-absolute-wallpaper-install-dir.patch
   ];
 
+
   NIX_CFLAGS_COMPILE = [
     ''-DNIXPKGS_XMESSAGE="${getBin xmessage}/bin/xmessage"''
     ''-DNIXPKGS_XRDB="${getBin xrdb}/bin/xrdb"''