setup: do not error when robotlocomotion/director is not tapped (Robo…

…tLocomotion#14428)

* setup: do not error when robotlocomotion/director is not tapped

setup/mac/binary_distribution/install_prereqs.sh

@@ -18,8 +18,9 @@ if ! command -v /usr/local/bin/brew &>/dev/null; then
   /usr/bin/ruby -e "$(/usr/bin/curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
 fi
 
-# TODO(jamiesnape): Remove lines uninstalling [email protected], [email protected], and
-# [email protected] on or after 2021-02-01.
+# TODO(jamiesnape): Remove lines tapping robotlocomotion/director and
+# uninstalling [email protected], [email protected], and [email protected] on or after 2021-02-01.
+/usr/local/bin/brew tap robotlocomotion/director
 /usr/local/bin/brew uninstall --force $(cat <<EOF
 robotlocomotion/director/[email protected]
 robotlocomotion/director/[email protected]