Don't lose exception callstack if error during startup

--HG--
branch : 1.x
extra : transplant_source : %B6%B7%FDp%C1%16G%D4%16%9E%F7%85%99%E50%B9%F8%0C%CC%D1

src/Orchard.Startup/Starter.cs

@@ -17,7 +17,7 @@ namespace Orchard.WarmupStarter {
                 // so we need to simulate a "restart".
                 var error = _error;
                 LaunchStartupThread(registrations);
-                throw error;
+                throw new ApplicationException("Error during Orchard startup", error);
             }
 
             // Only notify if the host has started up