[gnome-calculator] appdata: Mark at least one of the screenshots as default

[Richard Hughes <rhughes src gnome org>]

commit 8a87706f157a0fd9b09ce1ab44015dc528ceb8b7
Author: Richard Hughes <richard hughsie com>
Date:   Tue Jun 10 16:03:50 2014 +0100

    appdata: Mark at least one of the screenshots as default
    
    The largest one chosen was the default for the software center.

 data/gnome-calculator.appdata.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/gnome-calculator.appdata.xml.in b/data/gnome-calculator.appdata.xml.in
index 935c468..f04057b 100644
--- a/data/gnome-calculator.appdata.xml.in
+++ b/data/gnome-calculator.appdata.xml.in
@@ -33,7 +33,7 @@
     <screenshot>https://people.gnome.org/~mcatanzaro/gnome-calculator-basic-mode.png</screenshot>
     <screenshot>https://people.gnome.org/~mcatanzaro/gnome-calculator-advanced-mode.png</screenshot>
     <screenshot>https://people.gnome.org/~mcatanzaro/gnome-calculator-financial-mode.png</screenshot>
-    <screenshot>https://people.gnome.org/~mcatanzaro/gnome-calculator-programming-mode.png</screenshot>
+    <screenshot 
type="default">https://people.gnome.org/~mcatanzaro/gnome-calculator-programming-mode.png</screenshot>
   </screenshots>
   <url type="homepage">https://wiki.gnome.org/Apps/Calculator</url>
   <updatecontact>mcatanzaro_at_gnome.org</updatecontact>