onPan: Remove actualDelta which was meant to indicate which scale was panned in favor of conciseness.

Author: valerianoceanflight

src/core.ts

@@ -221,21 +221,18 @@ export function pan(chart: Chart, delta: PanAmount, enabledScales?: Scale[], tra
   const yEnabled = y !== 0
 
   const scales = enabledScales || Object.values(chart.scales)
-  const actualDelta = { x: 0, y: 0 }
 
   for (const scale of scales) {
     if (scale.isHorizontal() && xEnabled) {
-      actualDelta.x = x
       panScale(scale, x, limits, state)
     } else if (!scale.isHorizontal() && yEnabled) {
-      actualDelta.y = y
       panScale(scale, y, limits, state)
     }
   }
 
   chart.update(transition)
 
-  onPan?.({ chart, trigger, delta: actualDelta })
+  onPan?.({ chart, trigger, delta: { x, y } })
 }
 
 export function getInitialScaleBounds(chart: Chart) {