make callback name consistent

Author: zqianem

src/client/theme-default/composables/outline.ts

@@ -122,7 +122,7 @@ export function useActiveAnchor(
   onMounted(() => {
     requestAnimationFrame(setActiveLink)
     window.addEventListener('scroll', onScroll)
-    container.value.addEventListener('click', handleClick)
+    container.value.addEventListener('click', onClick)
   })
 
   onUpdated(() => {
@@ -132,10 +132,10 @@ export function useActiveAnchor(
 
   onUnmounted(() => {
     window.removeEventListener('scroll', onScroll)
-    container.value.removeEventListener('click', handleClick)
+    container.value.removeEventListener('click', onClick)
   })
 
-  function handleClick(e: MouseEvent) {
+  function onClick(e: MouseEvent) {
     if (!isAsideEnabled.value || !(e.target instanceof HTMLAnchorElement)) {
       return
     }