[pitivi] Standardize AppStream ID with "org.pitivi.Pitivi"

[Alexandru Băluț <alexbalut src gnome org>]

commit 1ea91d14f3739ef3108af381f0f79c81a754ec42
Author: Nathaniel Graham <pointedstick zoho com>
Date:   Sat Dec 23 20:23:32 2017 -0700

    Standardize AppStream ID with "org.pitivi.Pitivi"

 data/pitivi.appdata.xml.in |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/data/pitivi.appdata.xml.in b/data/pitivi.appdata.xml.in
index 61db3da..7f811b7 100644
--- a/data/pitivi.appdata.xml.in
+++ b/data/pitivi.appdata.xml.in
@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Copyright 2013 Jean-François Fortin Tam <nekohayo gmail com> -->
 <component type="desktop">
-  <id>pitivi.desktop</id>
+  <id>org.pitivi.Pitivi</id>
+  <launchable type="desktop">pitivi.desktop</launchable>
   <metadata_license>CC-BY-3.0</metadata_license>
   <project_license>LGPL-2.0+</project_license>
   <_name>Pitivi</_name>