Removed IsUnitTest check in Material Load functions

Author: TheDimin

engine/Sandbox.Engine/Resources/Material/Material.Load.cs

@@ -14,9 +14,6 @@ public static Material Load( string filename )
 	{
 		ThreadSafe.AssertIsMainThread();
 
-		if ( Application.IsUnitTest )
-			return default;
-
 		if ( !string.IsNullOrWhiteSpace( filename ) && Directory.TryLoad( filename, ResourceType.Material, out object model ) && model is Material m )
 			return m;
 
@@ -32,9 +29,6 @@ public static async Task<Material> LoadAsync( string filename )
 	{
 		ThreadSafe.AssertIsMainThread();
 
-		if ( Application.IsUnitTest )
-			return default;
-
 		if ( !string.IsNullOrWhiteSpace( filename ) && await Directory.TryLoadAsync( filename, ResourceType.Material ) is Material m )
 			return m;