Commit 81f92f1fe introduced a selective update mechanism to
_accounts_save() to prevent overwrites when running multiple instances
by only modifying the specific account being saved.
There was one mistake: the logic for adding a new
account was tied to the final iteration of a loop over
existing accounts.
When starting with an empty accounts file, the
loop never executes though.
We can call g_key_file_set_value() directly and don't need the loop
because this function will only modify one entry or add it if it doesn't
exist.
5c484c26ed