Fix taking screenshots with wxPython on Linux and Python 2.7 (#3407)
Fix taking screenshots with wxPython on Linux and Python 2.7 (#3407)

Fixes #3403.
HelioGuilherme66/robotframework,robotframework/robotframework,HelioGuilherme66/robotframework,robotframework/robotframework,HelioGuilherme66/robotframework,robotframework/robotframework