fix: updated typo in credit-cards.php credit card image filename

[infysumanta]

What does this PR do?

Its fixed double typo in credit card enum and image avatar

Fixes: #8062

Test Plan

Tested on local deployment environment

Related PRs and Issues

• 🐛 Bug Report: Double typo in credit card enum #8062

Checklist

• Have you read the Contributing Guidelines on issues?
• If the PR includes a change to an API's metadata (desc, label, params, etc.), does it also include updated API specs and example docs?

[stnguyen90]

@infysumanta, please also make sure to comment in the original issue to ask to be assigned on the issue.

[infysumanta]

Thank you, @stnguyen90. Actually, I am new to the contribution journey. I will make sure to ask before raising a PR and will fix the spelling and update it.