t1410: remove superfluous 'git reflog' from the 'walk past root' test

The test added in 71abeb7 (reflog: continue walking the reflog
past root commits, 2016-06-03) contains an unnecessary 'git reflog'
execution, which was part of my debug/tracing instrumentation that I
somehow didn't manage to remove before submitting.

Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: szeder

t/t1410-reflog.sh

@@ -359,7 +359,6 @@ test_expect_success 'continue walking past root commits' '
 		HEAD@{3} commit (initial): initial
 		EOF
 		test_commit initial &&
-		git reflog &&
 		git checkout --orphan orphan1 &&
 		test_commit orphan1-1 &&
 		test_commit orphan1-2 &&