jrnl should not (necessarly) try to update the configuration

[matthiasbeyer]

Diagnostic output

I use nix to configure my system. This means that the jrnl configuration will be a symlink and its contents won't be writable by jrnl.

This is why I think jrnl should not auto-update the configuration file contents. Or at least I should be able to configure it not to.

Current Behavior

jrnl writes to the config file if it finds a missing key.

Expected Behavior

jrnl only changes the configuration file if I tell it to, or it is not explicitly forbidden in the configuration file.

Repro Steps

Normal jrnl installation

Debug output

Not applicable

Other Information

No response