t0024: avoid losing exit status to pipes

t0024: avoid losing exit status to pipes

Replace pipe with redirection operator '>' to store the output
to a temporary file after 'git archive' command since the pipe
will swallow the command's exit code and a crash won't
necessarily be noticed.

Also fix an unwanted space after redirection '>' to match the
style described in CodingGuidelines.

Signed-off-by: Ghanshyam Thakkar <shyamthakkar001@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>