JS: avoid double-prefixing the path onto saved files
JS: avoid double-prefixing the path onto saved files

This is just a bandaid until this code is finally refactored.

Signed-off-by: Harvey Harrison <eadbd6b462bf3c97df0300a934c12bc2e5d1fe51@ausenco.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim