Add wallpapers from wallpaper contest.

Summary:
Add wallpapers from contest.
Remove old wallpapers.

Test Plan:
Boot daily image.
Check for new artwork on the desktop/login.

Reviewers: wxl, tsimonq2

Subscribers: guiverc, apt-ghetto, teward

Differential Revision: https://phab.lubuntu.me/D88

debian/changelog

@@ -1,3 +1,11 @@
+lubuntu-artwork (20.04.3) focal; urgency=medium
+
+  * Add wallpapers from wallpaper contest.
+  * Add wallpapers to artwork install file.
+  * Remove old wallpapers.
+
+ -- Dan Simmons <kc2bez@lubuntu.me>  Tue, 14 Apr 2020 00:39:15 -0400
+
 lubuntu-artwork (20.04.2) focal; urgency=medium
 
   * Added Lubuntu Round Openbox Theme.

debian/lubuntu-artwork.install

@@ -1,5 +1,4 @@
-usr/share/lubuntu/wallpapers/1804-*
-usr/share/lubuntu/wallpapers/1910-*
+usr/share/lubuntu/wallpapers/2004-*
 usr/share/lubuntu/wallpapers/lubuntu-default-wallpaper.png
 usr/share/lxqt/themes/Lubuntu*
 usr/share/themes/

src/usr/share/lubuntu/wallpapers/lubuntu-default-wallpaper.png

@@ -1 +1 @@
-1910-Lubuntu-default-wallpaper.png
+2004-lubuntu-wire-humming.png