RFR - JImageListTest test fix

[Michal Vala]

Hi,

sending patch fixing JImageListTest failing tests. It was in ProblemList and 
this fix greens the test case, so the patch also removes it from the list.
It will probably need new bug id and I will need a sponsor for this.

Fix itself is simple. There was incorrect assert for list of images contains 
java.base image as it was testing index of "java.base" > 0 and it's usually at 
first place, thus index 0. I've changed it to List#contains.

Thanks!

-- 
Michal Vala
OpenJDK QE
Red Hat Czech
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