Fixed exception on Resources.Load

This is a naive fix for a bug i faced just now. When you load a prefab resource from a directory where you have a script with the same name, the wrong file is loaded and the late cast breaks with an invalid cast exception.

for the illustration, here is my directory listing:

Parasites.cs <- this one is loaded instead of the prefab...
Parasites.prefab

UnityProject/Assets/Plugins/Zenject/Source/Runtime/Providers/PrefabProviders/PrefabProviderResource.cs

@@ -17,7 +17,7 @@ public PrefabProviderResource(string resourcePath)
 
         public UnityEngine.Object GetPrefab(InjectContext context)
         {
-            var prefab = (GameObject)Resources.Load(_resourcePath);
+            var prefab = Resources.Load<GameObject>(_resourcePath);
 
             Assert.That(prefab != null,
                 "Expected to find prefab at resource path '{0}'", _resourcePath);