ci: fix check for Ubuntu 20.04

In 5ca0c45 (ci: fix Python dependency on Ubuntu 24.04, 2024-05-06),
we made the use of Python 2 conditional on whether or not the CI job
runs Ubuntu 20.04. There was a brown-paper-bag-style bug though, where
the condition forgot to invoke the `test` builtin. The result of it is
that the check always fails, and thus all of our jobs run with Python 3
by accident.

Fix this.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

ci/lib.sh

@@ -328,7 +328,7 @@ ubuntu-*)
 	# Python 2 is end of life, and Ubuntu 23.04 and newer don't actually
 	# have it anymore. We thus only test with Python 2 on older LTS
 	# releases.
-	if "$distro" = "ubuntu-20.04"
+	if test "$distro" = "ubuntu-20.04"
 	then
 		PYTHON_PACKAGE=python2
 	else