[banshee] MediaEngineTests: fix typo in AssertionFailure message

[Andrés Aragoneses <aaragoneses src gnome org>]

commit 04af37d0c9950ac8b59fb9d964e19fb6403c6ace
Author: Andrés G. Aragoneses <knocte gmail com>
Date:   Sun Jan 19 21:02:39 2014 +0100

    MediaEngineTests: fix typo in AssertionFailure message

 .../Banshee.Services/Banshee.MediaEngine/Tests.cs  |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/Core/Banshee.Services/Banshee.MediaEngine/Tests.cs 
b/src/Core/Banshee.Services/Banshee.MediaEngine/Tests.cs
index c9ba49c..a2f4ac8 100644
--- a/src/Core/Banshee.Services/Banshee.MediaEngine/Tests.cs
+++ b/src/Core/Banshee.Services/Banshee.MediaEngine/Tests.cs
@@ -208,7 +208,7 @@ namespace Banshee.MediaEngine
             while (result_count < states.Length) {
                 reset_event.Reset ();
                 if (!reset_event.WaitOne (3000)) {
-                    Assert.Fail (String.Format ("Waited 3s for state/event, didnt' happen"));
+                    Assert.Fail (String.Format ("Waited 3s for state/event, didn't happen"));
                     break;
                 }
             }