Fixed the test condition

[IIGhouLII]

Fixed the unexpected behavior of the featured image. When I compile the old version, the image does not show up in few posts. Now, it works perfectly.

Description

Motivation and Context

How Has This Been Tested?

Hugo Version:

Browser(s):

Screenshots (if appropriate):

Types of changes

• 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:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation, including theme.toml, accordingly.
• I have read the Contributing Document.

[pacollins]

If someone could test this for me, that would be great. I am swamped with other work at the moment.
@statnmap @BernCarney
Thanks for the PR regardless. I had tried to fix this and I thought it was until I noticed the error again the other day.