[network-manager-applet] appdata: remove a stray closing tag

[Piotr Drąg <piotrdrag src gnome org>]

commit 74ed65d5862b5a3e426f4e28a62043775f0d91bd
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Aug 19 17:26:46 2017 +0200

    appdata: remove a stray closing tag
    
    How did it even validate?

 nm-connection-editor.appdata.xml.in |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/nm-connection-editor.appdata.xml.in b/nm-connection-editor.appdata.xml.in
index 03b3f4b..b59ea74 100644
--- a/nm-connection-editor.appdata.xml.in
+++ b/nm-connection-editor.appdata.xml.in
@@ -17,7 +17,6 @@
   <screenshots>
     <screenshot type="default">
       <image width="772" 
height="548">https://git.gnome.org/browse/network-manager-applet/plain/nm-connection-editor.png</image>
-      <_caption/>
     </screenshot>
   </screenshots>