JLink detection still unstable

[light-matters]

Tried to use Wolframite on another machine (Still linux, Manjaro, but Mathematica version 13.0) and ran into more JLink path problems. Not sure why Wolfram has so many default paths...

This time, there is an extra subdirectory in the path which breaks the absolute path constructor.

We should probably move to using a more intelligent system, i.e. to programmatically 'search' for the binaries, at least as a backup when the default paths don't work.