fix(hide-caret): blur listener correctly removed

[joewoodhouse]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

The enableHideCaretOnScroll shim does not properly remove the event listeners it adds to the input element. Because the listener is a closure containing references to the input and container (ion-content) element, this means those elements can never be free by the GC

Issue URL: #26807

What is the new behavior?

The shim now properly removes the event listener

Does this introduce a breaking change?

• Yes
• No

Other information

[liamdebeasi]

Thanks for fixing this!