DumbPaintTool: Fix multiple empty layers linked

docs/MDNotes/DumbPaintTool.TODO.md

@@ -2,8 +2,9 @@
  - [ ] Ask to Save on quit
  - [ ] Fix CanvasLayer Sizes on Save 
  - [ ] Brush colors applied back to Palette
+ - [x] Fix multiple layers added linked together
  - AppTemplate 
    -  [ ] Title, show the bar
    -  [ ] Add Title in the menuBar if available
 - Tree
-   - [ ] Expose resize 
+   - [x] Expose resize 

tools/dumbPaintTool/app/layersctrl.py

@@ -154,7 +154,7 @@ class LayerScrollWidget(ttk.TTkAbstractScrollView):
     @ttk.pyTTkSlot(CanvasLayer)
     def _layerSelected(self, data:CanvasLayer) -> None:
         for btn in self._layerButtons:
-            btn.setSelected(btn.data() == data)
+            btn.setSelected(id(btn.data()) == id(data))
 
     @ttk.pyTTkSlot(list[CanvasLayer])
     def _layersOrderChanged(self, layers:list[CanvasLayer]) -> None: