Hi,
Firstly, I would not recommend that you change this path as it makes future updates more tricky.
If you however need to do it, you must change the path in the “installer” and “loader” files to reflect the “/SPJS2/” folder and not the “/SPJS/” folder. There will be a number of places you need to change it, but as these files are not minified it should be an easy search and replace.
The variable “spjs_scripts_in_current_site” only determines whether the script tries to read the files form the current site or from the site collection root.
Alexander