fix wrong usage of variable introduced with 2450 #488

Job	Run time
bookworm armv7 / build	13m 22s
bullseye armv7 / build	12m 1s
bullseye armv7 / test (run_install_common.sh)	13m 25s
bullseye armv7 / test (run_install_faststartup.sh)	10m 26s
bullseye armv7 / test (run_install_webapp_local.sh)	20m 52s
bullseye armv7 / test (run_install_webapp_download.sh)	14m 48s
bullseye armv7 / test (run_install_libzmq_local.sh)	24m 23s
bookworm armv7 / test (run_install_common.sh)	14m 42s
bookworm armv7 / test (run_install_faststartup.sh)	10m 51s
bookworm armv7 / test (run_install_webapp_local.sh)	20m 16s
bookworm armv7 / test (run_install_webapp_download.sh)	13m 16s
bookworm armv7 / test (run_install_libzmq_local.sh)	24m 58s
bullseye armv7 / cleanup	2s
bookworm armv7 / cleanup	3s
	3h 13m 25s

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