Fix logging for background thread

src/modules/espresso/Espresso.Shell/Core/APIHelper.cs

@@ -105,7 +105,6 @@ namespace Espresso.Shell.Core
 
             // In case cancellation was already requested.
             //ThreadToken.ThrowIfCancellationRequested();
-
             try
             {
                 if (keepDisplayOn)
@@ -153,6 +152,7 @@ namespace Espresso.Shell.Core
             }
             catch (OperationCanceledException ex)
             {
+                log.Debug($"Background thread termination. Message: {ex.Message}");
                 // Task was clearly cancelled.
                 return success;
             }