test(e2e): reach the end of the diff with Meta+End

Meta+ArrowDown now jumps to source in the diff viewer, so the scattered
edits test never left the first difference.

e2e/diff.spec.ts

@@ -300,7 +300,7 @@ test.describe("10,000-line files", () => {
         await expect.poll(async () => (await rendered(page)).b.words).toContainEqual(["computeFast", "modified"]);
       }
       // The last difference is reachable and still highlighted.
-      await page.keyboard.press("Meta+ArrowDown");
+      await page.keyboard.press("Meta+End");
       await page.keyboard.press("Shift+F7");
       await expect(counter(page)).toHaveText("42 of 42 differences");
       if (opts.mode === "unified") {