[applications] add desktop file for Budgie

- this fixes #658

data/applications/meson.build

@@ -3,6 +3,7 @@ install_data('pamac-updater.desktop', install_dir: join_paths(get_option('datadi
 install_data('pamac-manager.desktop', install_dir: join_paths(get_option('datadir'), 'applications'))
 install_data('org.manjaro.pamac.manager.desktop', install_dir: join_paths(get_option('datadir'), 'applications'))
 install_data('pamac-tray.desktop', install_dir: join_paths(get_option('sysconfdir'), 'xdg', 'autostart'))
+install_data('pamac-tray-budgie.desktop', install_dir: join_paths(get_option('sysconfdir'), 'xdg', 'autostart'))
 if get_option('enable-appindicator')
 	install_data('pamac-tray-appindicator.desktop', install_dir: join_paths(get_option('sysconfdir'), 'xdg', 'autostart'))
 endif

data/applications/pamac-tray-budgie.desktop

+[Desktop Entry]
+Name=Update Notifier
+Icon=update-notifier
+Exec=sh -c "GDK_BACKEND=x11 pamac-tray"
+Terminal=false
+Type=Application
+StartupNotify=false
+OnlyShowIn=Budgie;