fix: prevent scroll position getting reset when modal is opened

[ravise5]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #483

Test URLs:

• Before:
  • https://main--shredit--stericycle.aem.page/
• After:
  • https://issue483--shredit--stericycle.aem.page/

[aem-code-sync[bot]]

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Commits

* [6320a38](https://github.com/aemsites/stericycle-shared/commit/6320a38ead0ae5605473dc79f42d924192e6861b) :white_check_mark: (latest) * [f5955af](https://github.com/aemsites/stericycle-shared/commit/f5955afba9b46ac5b686ffa693923318e47ffb6d) :white_check_mark:

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[aem-code-sync[bot]]

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