Fix running tests when pwd contains non-ASCII characters.
Fix running tests when pwd contains non-ASCII characters.

See PR #2236 for details.

HelioGuilherme66/robotframework,snyderr/robotframework,joongh/robotframework,joongh/robotframework,jaloren/robotframework,joongh/robotframework,snyderr/robotframework,alexandrul-ci/robotframework,snyderr/robotframework,joongh/robotframework,alexandrul-ci/robotframework,joongh/robotframework,jaloren/robotframework,jaloren/robotframework,snyderr/robotframework,HelioGuilherme66/robotframework,alexandrul-ci/robotframework,HelioGuilherme66/robotframework,robotframework/robotframework,alexandrul-ci/robotframework,robotframework/robotframework,jaloren/robotframework,jaloren/robotframework,robotframework/robotframework,alexandrul-ci/robotframework,snyderr/robotframework