test(popover): add missing screenshot function (#27399)

Issue number: N/A

---------

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## What is the current behavior?
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A skipped popover test was missing a screenshot function

## What is the new behavior?
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this PR. -->

- Added missing screenshot function

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->

core/src/components/popover/test/size/popover.e2e.ts

@@ -27,7 +27,7 @@ configs({ modes: ['ios'], directions: ['ltr'] }).forEach(({ title, screenshot, c
       await expect(page).toHaveScreenshot(screenshot(`popover-size`));
 
       // test this one separately since it would overlap others
-      await screenshotPopover(page, 'no-event-trigger', 'size');
+      await screenshotPopover(page, screenshot, 'no-event-trigger', 'size');
     });
   });
 });