fix test cases viewer

tests/godot_project/viewers/just_mesh.tscn

@@ -1,6 +1,6 @@
 [gd_scene load_steps=2 format=2]
 
-[ext_resource path="res://exports/just_mesh.escn" type="PackedScene" id=1]
+[ext_resource path="res://exports/mesh/just_mesh.escn" type="PackedScene" id=1]
 
 [node name="Scene Root" index="0" instance=ExtResource( 1 )]
 

tests/godot_project/viewers/tangent_test.tscn

@@ -2,7 +2,7 @@
 
 
 
-[ext_resource path="res://exports/tangent_test.escn" type="PackedScene" id=1]
+[ext_resource path="res://exports/mesh/tangent_test.escn" type="PackedScene" id=1]
 [ext_resource path="res://uvtester_normals.jpg" type="Texture" id=2]
 
 [sub_resource type="SpatialMaterial" id=1]

tests/godot_project/viewers/uv_testing.tscn

@@ -1,6 +1,6 @@
 [gd_scene load_steps=4 format=2]
 
-[ext_resource path="res://exports/uv_testing.escn" type="PackedScene" id=1]
+[ext_resource path="res://exports/mesh/uv_testing.escn" type="PackedScene" id=1]
 [ext_resource path="res://multi_uv_tester.tres" type="Material" id=2]
 [ext_resource path="res://uv_tester_material.tres" type="Material" id=3]
 

tests/godot_project/viewers/vertex_color.tscn

@@ -1,6 +1,6 @@
 [gd_scene load_steps=3 format=2]
 
-[ext_resource path="res://exports/vertex_color.escn" type="PackedScene" id=1]
+[ext_resource path="res://exports/mesh/vertex_color.escn" type="PackedScene" id=1]
 
 [sub_resource type="SpatialMaterial" id=1]