fix(ui): sync pointer position on pointerdown

There's a Konva bug where `pointerenter` & `pointerleave` events aren't fired correctly on the stage.

In 87fdea4cc6 I made a change that surfaced this bug, breaking touch and Apple Pencil interactions, because the cursor position doesn't get updated.

Simple fix - ensure we update the cursor on `pointerdown` events, even though we shouldn't need to.

Will make a bug report upstream

invokeai/frontend/web/src/features/controlLayers/konva/CanvasTool/CanvasToolModule.ts

@@ -395,6 +395,7 @@ export class CanvasToolModule extends CanvasModuleBase {
       const isMouseDown = getIsPrimaryMouseDown(e);
       this.$isMouseDown.set(isMouseDown);
 
+      this.syncCursorPositions();
       const cursorPos = this.$cursorPos.get();
       const tool = this.$tool.get();
       const settings = this.manager.stateApi.getSettings();