test: Fix fedorapeople.org image URL
test: Fix fedorapeople.org image URL

Commit 9cb8b37eb dropped the trailing slash, which causes the "/images"
part to be cut off.

Closes #6484 
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>
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