test-lib.sh: set COLUMNS=80 for --verbose repeatability

Some tests will fail under --verbose because while we've unset COLUMNS since b1d645b58ac (tests: unset COLUMNS inherited from environment, 2012-03-27), we also look for the columns with an ioctl(.., TIOCGWINSZ, ...) on some platforms. By setting COLUMNS again we preempt the TIOCGWINSZ lookup in pager.c's term_columns(), it'll take COLUMNS over TIOCGWINSZ, This fixes t0500-progress-display.sh., which broke because of a combination of the this issue and the progress output reacting to the column width since 545dc345ebd (progress: break too long progress bar lines, 2019-04-12). The t5324-split-commit-graph.sh fails in a similar manner due to progress output, see [1] for details. The issue is not specific to progress.c, the diff code also checks COLUMNS and some of its tests can be made to fail in a similar manner[2], anything that invokes a pager is potentially affected. See ea77e675e56 (Make "git help" react to window size correctly, 2005-12-18) and ad6c3739a33 (pager: find out the terminal width before spawning the pager, 2012-02-12) for how the TIOCGWINSZ code ended up in pager.c 1. http://lore.kernel.org/git/20210624051253.GG6312@szeder.dev 2. https://lore.kernel.org/git/20210627074419.GH6312@szeder.dev/ Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>