fix: Filter out "load" errors from thumbnail error reporting

[KevinPayravi]

Our new thumbnail error reporting is filled with load errors. When looking into them, I found that the thumbnails loaded fine in my browser. But digging it into more, I believe the root cause is that our thumbnails don't have a Content-Type header. This may cause thumbnails to silently fail in the background, or potentially in cases of scrapers/crawlers trying to "view" them.

I've created two PRs on the thumbnail-api and thumbnailer-lambda repos to fix this, by attaching a correct Content-Type to our thumbnails:
dpla/thumbnail-api#31
dpla/thumbnailer-lambda#12

In the meantime, this PR removes "load" errors from our logging to cut back on the noise. We may restore it if we want once the Content-Type fixes are deployed.

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• lib/probeImage.js

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