remove unnessary title

Author: williamchange

material_maker/windows/file_dialog/file_dialog.tscn

@@ -3,10 +3,9 @@
 [ext_resource type="Script" uid="uid://2m7bxcehwc5a" path="res://material_maker/windows/file_dialog/file_dialog.gd" id="1"]
 
 [node name="FileDialog" type="FileDialog"]
-title = "Open File"
+title = "Open a File"
 initial_position = 2
 size = Vector2i(500, 400)
-visible = false
 ok_button_text = "Open"
 file_mode = 0
 access = 2