This delta aligns the value of `PATH` variable with other
shells/distros, which in their default configuration preserve
(append) the old value.
For instance: https://src.fedoraproject.org/rpms/bash/blob/master/f/dot-bashrc#_9.
In order to exercise interoperability with Win32 applications
in WSL, the subsystem process injects Windows environment's
PATH to the Linux OS, which in this case gets lost.
closes#6233
Co-authored-by: maxice8 <thinkabit.ukim@gmail.com>
20c06e3b0a