[Fix] `nvm ls`, `nvm alias`, `nvm install`: error when an LTS name is… #1401

Job	Run time
shellcheck_matrix (bash, nvm.sh)	42s
shellcheck_matrix (sh, nvm.sh)	43s
shellcheck_matrix (dash, nvm.sh)	44s
shellcheck_matrix (ksh, nvm.sh)	42s
shellcheck_matrix (bash, install.sh)	24s
shellcheck_matrix (bash, bash_completion)	29s
shellcheck_matrix (bash, nvm-exec)	26s
shellcheck	1s
	4m 11s

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