fix(classifier): Polygon tool drag handles

Refactor the polygon tool drag handles so that `pointerdown` does not close and finish the shape, overriding the pointer dragging behaviour. Instead, the shape is closed and finished on `pointerup`.

packages/lib-classifier/src/plugins/drawingTools/components/Polygon/Polygon.js

@@ -72,7 +72,6 @@ function Polygon({ active, mark, scale, onFinish }) {
           strokeWidth={strokeWidth}
           strokeDasharray={strokeDasharray}
         />
-      )}
 
       {active &&
         points.map((point, i) => (
@@ -84,7 +83,7 @@ function Polygon({ active, mark, scale, onFinish }) {
               y={point.y}
               fill='currentColor'
               dragMove={point.moveTo}
-              onPointerDown={handleClosePolygon}
+              onPointerUp={handleClosePolygon}
             />
           ))
         }