[geary] Fix flatpak build error maybe.

[Michael Gratton <mjog src gnome org>]

commit e977c9864c6dfb9f40b20129c4c6b11e95ffd92e
Author: Michael James Gratton <mike vee net>
Date:   Thu Sep 28 23:25:35 2017 +1000

    Fix flatpak build error maybe.
    
    * desktop/org.gnome.Geary.appdata.xml.in: Set component type to
      desktop-application to work with non-desktop-based id value.

 desktop/org.gnome.Geary.appdata.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/desktop/org.gnome.Geary.appdata.xml.in b/desktop/org.gnome.Geary.appdata.xml.in
index 4efbff6..ede5b2c 100644
--- a/desktop/org.gnome.Geary.appdata.xml.in
+++ b/desktop/org.gnome.Geary.appdata.xml.in
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Copyright 2016 Software Freedom Conservancy Inc. -->
 <!-- Copyright 2016 Michael Gratton <mike vee net> -->
-<component type="desktop">
+<component type="desktop-application">
   <id>org.gnome.Geary</id>
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>LGPL-2.1+</project_license>