Fixes display problem with uploaded media files which contain a + character

Author: Michael-Herzog

src/Presentation/SmartStore.Web/Web.config

@@ -206,7 +206,7 @@
       <mimeMap fileExtension=".js" mimeType="text/javascript" />
     </staticContent>
     <security>
-      <requestFiltering>
+      <requestFiltering allowDoubleEscaping="true">
         <!-- Max. global file upload size on IIS level is 2 GB as defined by the 'maxAllowedContentLength' attribute (2147483648 Bytes). -->
         <requestLimits maxAllowedContentLength="2147483648" maxQueryString="16384" />
         <hiddenSegments>