Adjust the maintainer because we have a delta.

debian/control

@@ -1,5 +1,6 @@
 Source: lxqt-qtplugin
-Maintainer: LXQt Packaging Team <pkg-lxqt-devel@lists.alioth.debian.org>
+Maintainer: Lubuntu Developers <lubuntu-devel@lists.ubuntu.com>
+XSBC-Original-Maintainer: LXQt Packaging Team <pkg-lxqt-devel@lists.alioth.debian.org>
 Uploaders: Alf Gaida <agaida@siduction.org>,
            ChangZhuo Chen (陳昌倬) <czchen@debian.org>,
            Yukiharu YABUKI <yyabuki@debian.org>