[pitivi] proxy: Fix transcoder error callback parametters

[Thibault Saunier <tsaunier src gnome org>]

commit e62b72388f5ca652ee1a8631fb7fbcefef67d974
Author: Thibault Saunier <tsaunier igalia com>
Date:   Mon Jul 23 10:43:56 2018 -0400

    proxy: Fix transcoder error callback parametters

 pitivi/utils/proxy.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/pitivi/utils/proxy.py b/pitivi/utils/proxy.py
index 07e1af00..b51ca3ec 100644
--- a/pitivi/utils/proxy.py
+++ b/pitivi/utils/proxy.py
@@ -321,7 +321,7 @@ class ProxyManager(GObject.Object, Loggable):
         self.emit("proxy-ready", asset, proxy)
         self.__emitProgress(proxy, 100)
 
-    def __transcoderErrorCb(self, transcoder, error, asset):
+    def __transcoderErrorCb(self, transcoder, error, unused_details, asset):
         self.emit("error-preparing-asset", asset, None, error)
 
     def __transcoderDoneCb(self, transcoder, asset):