Fail when shell is true and folder has empty characters in its name

[trystan2k]

Hi @webpro,

Thanks for creating this NX Executor, I was looking after something to 'lint' my .ts files.

I have found an issue, thought. When the shell option in the spawn call is set to true (in the case of this executor, when it is running in Windows), if the folder where tsc is located has empty spaces on it (for example: C:\User\trystan2k\One Drive Files\my-project\node_modules\tsc), the spawn execution fails because it gets only the folder name until the first space (so it says something like "Cannot find folder C:\User\trystan2k\One").

After some researching, I found that we can work around this by setting the folder name between "" (but only when shell is true).

I will open a PR with this fix. Please let me know if it is ok or if you have any other suggestion.

Thank you !