Use exact If-Range match in our test webserver

RFC7233 3.2 If-Range specifies the comparison to be an exact match,
not a less or equal, which makes no sense in this context anyhow.
Our server exists only to write our tests against it so this isn't much
of a practical issue. I did confirm with a crashing server that no test
(silently) depends on this or exhibits a different behaviour not
explicitly checked for.

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