Stylistic change to Scan.

Rx.NET/Source/src/System.Reactive/Linq/Observable/Scan.cs

@@ -103,7 +103,9 @@ namespace System.Reactive.Linq.ObservableImpl
                 try
                 {
                     if (_hasAccumulation)
+                    {
                         _accumulation = _accumulator(_accumulation, value);
+                    }
                     else
                     {
                         _accumulation = value;