forked from CringeStudios/element-desktop

https://github.com/vector-im/riot-web/issues/12443 points out the electron eccentricity that the background of a BrowserWindow is 'transparent' (whatever that actually means in practice) by default which causes subpixel font rendering to be disabled. Set an explicit background colour as per the faq entry. Fixes https://github.com/vector-im/riot-web/issues/12443