x11-toolkits/py-wxPython4: Update to 4.1

• Rename wxPython40 to wxPython4
• Update to 4.1 version
• Fix wxgtk31 for string
• Use wxGtk31 instead of wxgtk30
• Fix kicad* ports with wxgtk31/wxPython 4.1

Changes:

• https://www.wxpython.org/news/2020-11-21-wxpython-411-release/index.html

Reviewed by: tcberner
Approved by: yuri, bofh
Differential Revision: D34080