Update RulesEngineContext.cs (#347)

This commit adds a line to RulesEngineContext.cs to make Entity Framework Core ignore WorkflowRulesToInject as well as WorkflowsToInject, which resolves an error causing the demo program to crash.  This fixes issue #346.

demo/DemoApp.EFDataExample/RulesEngineContext.cs

@@ -40,8 +40,9 @@ namespace RulesEngine.Data
                    v => JsonSerializer.Deserialize<RuleActions>(v, serializationOptions));
 
                 entity.Ignore(b => b.WorkflowsToInject);
+                entity.Ignore(b => b.WorkflowRulesToInject);
             });
         }
     }
 
-}
+}