[Tests] `install.sh`: clean up `nvm_detect_profile` tests #13

Job	Run time
shellcheck_matrix (bash, nvm.sh)	38s
shellcheck_matrix (sh, nvm.sh)	36s
shellcheck_matrix (dash, nvm.sh)	37s
shellcheck_matrix (ksh, nvm.sh)	33s
shellcheck_matrix (bash, install.sh)	22s
shellcheck_matrix (bash, bash_completion)	30s
shellcheck_matrix (bash, nvm-exec)	30s
shellcheck	1s
	3m 47s

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