tests: fix unzip -l variability fix

01-01-1980 slipped through the grep.

tests/test-archive

@@ -145,6 +145,6 b' touch -d 1975-01-01 old'
 hg add old
 hg commit -m old
 hg archive ../old.zip
-unzip -l ../old.zip | grep 80 && echo ok
+unzip -l ../old.zip | grep 80 > /dev/null && echo ok
 
 exit 0

tests/test-archive.out

@@ -81,6 +81,4 b" abort: unknown archive type 'bogus'"
 % empty repo
 abort: no working directory: please specify a revision
 % old file -- date clamped to 1980
-      147  1980-01-01 00:00   old/.hg_archival.txt
-        0  1980-01-01 00:00   old/old
 ok