Fixed the Equals method invokationorder

`e.Id.Equals(key)` is the right way to execute the method (because calling a Equals(e.Id, key) will try to cast them to `object`s (and It doesn't work inside that Linq expression) and `System.NotSupportedException` will appear.

Author: Alexander

src/AbpODataDemo.WebApi/Controllers/AbpODataEntityController.cs

@@ -51,7 +51,7 @@ public IQueryable<TEntity> Get()
         [EnableQuery]
         public SingleResult<TEntity> Get([FromODataUri] TPrimaryKey key)
         {
-            var entity = Repository.GetAll().Where(e => Equals(e.Id, key));
+            var entity = Repository.GetAll().Where(e => e.Id.Equals(key));
             return SingleResult.Create(entity);
         }