The actual usage is case insensitive, so this doesn't actually matter.
But if fills my heart with joy.
The test is case sensitive, but the actual response to `git config
commit.gpgSign` is equivalent to `git config commit.gppsign`
This allows changing git config values while lazygit is running (e.g. in a
different terminal tab, or even in lazygit's ":" shell prompt), and have them
take effect immediately, while still getting some benefit from caching them
while lazygit is in the foreground.
