fix(select): prevent click event from firing twice (#27570)

Issue number: N/A

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## What is the current behavior?
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The click event was firing twice.

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

- The click event fires once.

## 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. -->
You can use the test file to see that the event now fires once, and
before this change it fired twice. I couldn't figure out how to write an
automated test for this that fails before the change and passes after
the change. (Perhaps because of how Jest "clicks" elements? Not sure.)

Also, you can use the repro repo in the Jira ticket and update it to
`"@ionic/angular": "7.0.10-dev.11685472954.170be0cc",` and see that the
issue is fixed.