Add user profile for listener

[Acconut]

This pull request fixes a bug in unoconv, where the --user-profile flag is not respected and not passed to soffice. There seem to be two code paths which are responsible for launching soffice, but only one of them respects --user-profile.

So, when we ran unoconv --listener --port 3030 --user-profile=/tmp/unoconv-1, before this pull request, the user profile was not set in soffice (no -env:UserInstallation):

$ ps -elf | grep soffice
[...] /lib/libreoffice/program/soffice.bin --headless [...] --accept=socket,host=127.0.0.1,port=3030,tcpNoDelay=1;urp;StarOffice.ComponentContext

But now it is set properly:

$ ps -elf | grep soffice
[..] /lib/libreoffice/program/soffice.bin --headless [..] --accept=socket,host=127.0.0.1,port=3030,tcpNoDelay=1;urp;StarOffice.ComponentContext -env:UserInstallation=file:///tmp/unoconv-1

[Acconut]

A similar fix is also included in the (unmerged) PRs #519 and #558

[Acconut]

Closing this because unoconv is superseeded by unoserver.