tests/Makefile: Fix check-report.* targets shown in check-help

The check-report.html and check-report.xml targets were replaced
with check-report.tap in commit 9df43317b82 but the check-help
text was not updated so it still lists check-report.html.

Fixes: 9df43317b82
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20191211204427.4681-2-wainersm@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
1 file changed