Revert "move `demo/scene.tscn` to `test.tscn`"

This reverts commit 648dc48bc7.

project/demo/scene.tscn

@@ -0,0 +1,8 @@
+[gd_scene load_steps=2 format=3 uid="uid://c7u64tpv6byvb"]
+
+[ext_resource type="Script" path="res://demo/scene.gd" id="1_lih0m"]
+
+[node name="Scene" type="Node"]
+script = ExtResource("1_lih0m")
+
+[node name="MyNode" type="MyNode" parent="."]

project/project.godot

@@ -11,5 +11,5 @@ config_version=5
 [application]
 
 config/name="project"
-run/main_scene="res://test.tscn"
+run/main_scene="res://demo/scene.tscn"
 config/features=PackedStringArray("4.2", "Forward Plus")

project/test.tscn

@@ -1,8 +0,0 @@
-[gd_scene load_steps=2 format=3 uid="uid://dm7p2oqcqma0r"]
-
-[ext_resource type="Script" path="res://test.gd" id="1_b6plr"]
-
-[node name="Test" type="Node"]
-script = ExtResource("1_b6plr")
-
-[node name="MyNode" type="MyNode" parent="."]