distcheck: remove duplicate test/ entry
distcheck: remove duplicate test/ entry

It can be confusing to distcheck that we list it explicitly,
since it already adds it automatically, and we have configure
and build products in there.

Fixes: https://github.com/libuv/libuv/issues/2199
Refs: https://github.com/libuv/libuv/issues/2198
PR-URL: https://github.com/libuv/libuv/pull/2229
Reviewed-By: Ben Noordhuis <59bd0a3ff43b32849b319e645d4798d8a5d1e889@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <838f779c91673db29b8572ea3f54d191d3878ae2@gmail.com>

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso