main.py: PEP8 Fixes
main.py: PEP8 Fixes

Signed-off-by: Lucas Meneghel Rodrigues <75ff994d18a17892299c98a1dd68163bfb09a96f@gmail.com>

UtkarshGpta/bing-desktop-wallpaper-changer,nks15/bing-desktop-wallpaper-changer,nks15/bing-desktop-wallpaper-changer,UtkarshGpta/bing-desktop-wallpaper-changer,truongan/bing-desktop-wallpaper-changer