debian/patches/appdata-launchable.patch: Add launchable tag

This is needed as the .desktop file is not the same as the appdata file

debian/patches/appdata-launchable.patch

@@ -0,0 +1,10 @@
+--- a/scripts/python/app/nut-monitor.appdata.xml
++++ b/scripts/python/app/nut-monitor.appdata.xml
+@@ -2,6 +2,7 @@
+ <!-- Copyright 2014 Arnaud Quette <arnaud.quette@free.fr> -->
+ <component type="desktop-application">
+  <id>nut-monitor.desktop</id>
++ <launchable type="desktop-id">nut-monitor-py3qt5.desktop</launchable>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-3.0+</project_license>
+  <name>NUT Monitor</name>

debian/patches/series

@@ -4,3 +4,4 @@
 
 # Upstream patches
 #0013-fix-doc-build.patch
+appdata-launchable.patch