Fix bug by adding missing classes in img element in select component

[Talagozis]

Proposed changes

It fixes the #5797 issue.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue).
• [ ] New feature (non-breaking change which adds functionality).
• [ ] Breaking change (fix or feature that would cause existing functionality to change).

Checklist:

• [x] I have read the CONTRIBUTING document.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[Talagozis]

Any eye on this?

[DanielRuf]

@Talagozis you might want to provide the same PR for https://github.com/materializecss/materialize which is an actively maintained fork of materialize.