4d8a055 (#19226) introduced incorrect instructions for 'opting out' of dark mode in Electron 7.0.0 and for enabling it on older versions. The boolean values for the `NSRequiresAquaSystemAppearance` key were inverted.
This adds the NSRequiresAquaSystemAppearance key to our default Info.plist file which will tell macOS to auto-switch our effectiveAppearance in sync with the OS. The dark mode documentation has been updated to reflect how to opt *out* of this but it is also noted that certain dark mode APIs will not work on Catalina if you opt out.
* Update mojave-dark-mode-guide.md
Add info about dark mode support in electron-builder
* Update mojave-dark-mode-guide.md
* Update mojave-dark-mode-guide.md
