t1400: drop debug `echo` to actually execute `test`

Instead of running `test "foo" = "$(bar)"`, we prefix the whole thing
with `echo`. Comparing to nearby tests makes it clear that this is just
debug leftover. This line has actually been modified four times since it
was introduced in e52290428b (General ref log reading improvements.,
2006-05-19) and the `echo` has always survived. Let's finally drop it.

This script could need some more cleanups. This is just an immediate fix
so that we actually test what we intend to.

All other hits for `git grep "\<echo test " -- t/` seem fine. They want
to create some input or expected output data.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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