[chronojump] Fixes crash: returns the key and not a key named "key".

[Carles Pina i Estany <carlespina src gnome org>]

commit 5746375806590d921f11fae467ae5e9da64ced56
Author: Carles Pina i Estany <carles pina cat>
Date:   Wed Oct 26 18:50:40 2016 +0200

    Fixes crash: returns the key and not a key named "key".

 src/json.cs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/json.cs b/src/json.cs
index 4814f26..1d16a35 100644
--- a/src/json.cs
+++ b/src/json.cs
@@ -252,7 +252,7 @@ class JsonUtils
                // Returns jsonObject[key] if it exists. If the key doesn't exist returns defaultValue and
                // logs the anomaly into the Chronojump log.
                if (jsonObject.ContainsKey (key)) {
-                       return jsonObject ["key"];
+                       return jsonObject [key];
                } else {
                        LogB.Information ("JsonUtils::valueOrDefault: returning default (" + defaultValue + 
") from JSON: " + jsonObject.ToString ());
                        return defaultValue;