[tools] Fix map click handler in ic-panel

Bug: v8:10644
Change-Id: I14bbe3afcef09b0d2a785c61d603974c3c393d72
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2565121Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71478}

tools/system-analyzer/view/ic-panel.mjs

@@ -82,7 +82,7 @@ DOM.defineCustomElement(
       }
 
       handleMapClick(e) {
-        const group = e.target.parentNode.entry;
+        const group = e.target.parentNode.group;
         const id = group.key;
         const selectedMapLogEntries =
             this.searchIcLogEntryToMapLogEntry(id, group.entries);