cli: Use new --call-nos=no call to "apitrace dump-images" for consistent results

Recent "apitrace trim" is now dropping uninteresting calls by
default. This means that the call numbers of rendering operations are
changing. Consequently, image comparisons were failing not due to
image-content differences, but simply because the filenames (with
embedded call numbers in them) no longer matched.

We can avoid this problem by using the --call-nos=no option which was
added to "apitrace dump-images" in very recent versions.