ICU-22221 Add the -R flag to less to display ANSI colors.

Without this flag, any ANSI color escape sequences in the Maven error
log will be displayed in their escaped form, which isn't very readable.

tools/cldr/lib/install-cldr-jars.sh

@@ -42,7 +42,7 @@ function run_with_logging() {
     read -p "Show log file? " -n 1 -r
     echo
     if [[ "${REPLY}" =~ ^[Yy]$ ]] ; then
-      less -X "${LOG_FILE}"
+      less -RX "${LOG_FILE}"
     fi
     echo "Log file: ${LOG_FILE}"
     exit 1