Make qpt-deb-installer default app for Debian packages.

debian/changelog

@@ -1,3 +1,9 @@
+lubuntu-default-settings (21.04.2) hirsute; urgency=medium
+
+  * Make qapt-deb-installer the default app for Debian packages.
+
+ -- Walter Lapchynski <wxl@ubuntu.com>  Mon, 15 Feb 2021 13:43:55 -0800
+
 lubuntu-default-settings (21.04.1) hirsute; urgency=medium
 
   * Update XscreenSaver lock screen to 21.04.

src/etc/xdg/xdg-Lubuntu/mimeapps.list

@@ -8,7 +8,7 @@ application/pdf=qpdfview.desktop
 application/postscript=qpdfview.desktop
 application/rtf=libreoffice-writer.desktop
 application/tab-separated-values=libreoffice-calc.desktop
-application/vnd.debian.binary-package=org.kde.discover.desktop
+application/vnd.debian.binary-package=qapt-deb-installer.desktop
 application/vnd.flatpak=org.kde.discover.desktop
 application/vnd.flatpak.ref=org.kde.discover.desktop
 application/vnd.flatpak.repo=org.kde.discover.desktop