Electron updater doesn't update on checksum changes

[orowith2os]

Currently, the Electron data checker only checks for the version inside of the yml file. This is fine for a majority of use cases, as they update their versions when making an update.

However, this doesn't work for ArmCord, as they have a build server which provides constantly rebuilt binaries against certain versions of Electron. They don't update the versions, only checksums.

This means that data checking for ArmCord is broken, and it will remain on an old version of ArmCord until they update the ArmCord version. This isn't desired.

https://github.com/flathub/xyz.armcord.ArmCord/blob/master/xyz.armcord.ArmCord.yml#L49
https://build.armcord.xyz/stable/v21.4.4/latest-linux.yml
https://github.com/flathub/flatpak-external-data-checker/blob/master/src/checkers/electronchecker.py