Add missing getClass() to image.phtml so it is more like image_with_borders.phtml

[woutersamaey]

Description (*)

Just a small template improvement:

• Add missing getClass() to image.phtml so it is more like image_with_borders.phtml
• Because we now use getClass() in the template, it becomes easier to add CSS classes with a plugin.

Manual testing scenarios (*)

Just a template change. Images should still work.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (not applicable)
• All automated tests passed successfully (all builds are green)

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[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-5432 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

[m2-assistant]

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