Fix loading of dropins with speculation rule pre-rendering

[herzog31]

Apply fix from https://github.com/hlxsites/boilerplate-commerce-dropins/pull/75

Test URLs:

• Before: https://main--aem-boilerplate-commerce--hlxsites.hlx.live/
• After:
  • https://dropin-loading--aem-boilerplate-commerce--hlxsites.hlx.live/
  • https://dropin-loading--aem-boilerplate-commerce--hlxsites.hlx.live/products/hollister-backyard-sweatshirt/MH05

[aem-code-sync[bot]]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed. In case there are problems, just click a checkbox below to rerun the respective action.

• [ ] Re-run PSI checks
• [ ] Re-sync branch

Commits

* [ef6dc3c](https://github.com/hlxsites/aem-boilerplate-commerce/commit/ef6dc3c800dd3d6c0cdc7e1076b7f07801554cde) :white_check_mark: (latest)

[aem-code-sync[bot]]

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