Script Window: Change control type to CodeEdit

Changing from TextEdit to CodeEdit shows a better background color,
making it more readable.

Author: manuq

addons/block_code/ui/script_window/script_window.tscn

@@ -49,7 +49,7 @@ layout_mode = 2
 [node name="VBox" type="VBoxContainer" parent="PanelContainer"]
 layout_mode = 2
 
-[node name="Code" type="TextEdit" parent="PanelContainer/VBox"]
+[node name="Code" type="CodeEdit" parent="PanelContainer/VBox"]
 unique_name_in_owner = true
 layout_mode = 2
 size_flags_vertical = 3