Correcting icon from "repeat" to "redo" in Security Dashboard.

What does this MR do?

This MR is part of the "Beautifying our UI" Epic. &989 (closed) as a fix to the following issue #13768 (closed).

This is a simple icon swap. Before the vulnerabilities list was using the repeat icon in the retry button instead of the redo icon which is the correct one for this functionality.

Screenshots

Before

After

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Fixes #13768 (closed)