'script' install doesn't work

[joelnn]

I believe the 'script' install (as opposed to git install) is broken, I end up with the contents of nvm-exec being identical to nvm.sh.

I think this is because NVM_SOURCE is set here https://github.com/creationix/nvm/blob/v0.23.3/install.sh#L78 and even though it is 'local', nvm_source() can see it the second time it is called at https://github.com/creationix/nvm/blob/v0.23.3/install.sh#L80

[ljharb]

@joelnn Thanks! Give this a try and let me know if it fixes the issue for you.

[joelnn]

@ljharb fixed indeed, thanks!