[Fix] `install.sh`: fix failing install tests from #3458 #1460

Job	Run time
shellcheck_matrix (bash, nvm.sh)	36s
shellcheck_matrix (sh, nvm.sh)	43s
shellcheck_matrix (dash, nvm.sh)	44s
shellcheck_matrix (ksh, nvm.sh)	40s
shellcheck_matrix (bash, install.sh)	23s
shellcheck_matrix (bash, bash_completion)	26s
shellcheck_matrix (bash, nvm-exec)	28s
shellcheck	1s
	4m 1s

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