GPencil: Change default Scale Thickness to True in 2D template

This parameter is more logic as true because is better scale thickness when the size of the stroke changes.

Reviewed by: @mendio @pepeland

release/scripts/startup/bl_app_templates_system/2D_Animation/__init__.py

@@ -46,6 +46,7 @@ def update_factory_startup_screens():
 def update_factory_startup_scenes():
     for scene in bpy.data.scenes:
         scene.tool_settings.use_keyframe_insert_auto = True
+        scene.tool_settings.gpencil_sculpt.use_scale_thickness = True
 
 
 def update_factory_startup_grease_pencils():