Properly ignore middle and right clicks in InteractiveImage

vue/Image/InteractiveImage.vue

@@ -273,7 +273,7 @@ export default {
     },
     mouseAction (e, action) {
       // Ignore everything but the left mouse button
-      if (action === 'mousedown' && e.buttons !== 1) return
+      if (action === 'down' && e.buttons !== 1) return
 
       const position = this.getPosition(e)
       if (!position) throw new Error('Mouse position could not be determined on SVG layer.')