fix(flycheck): lint ledger buffers, which nothing ever did

flycheck-ledger registers a ledger checker, but a checker only runs where flycheck-mode is on, and flycheck-mode was hooked to sh-mode and emacs-lisp-mode only. There's no global-flycheck-mode. So an unbalanced transaction in a financial file produced no warning at all, while the ledger module's commentary advertised linting.

The hook goes in flycheck-config, not ledger-config, so that list stays the one answer to "where is flycheck turned on?".

Verified on an unbalanced fixture: flycheck now reports "Transaction does not balance" with the $10.00 remainder, on the right line.

I also accepted the whole-buffer sort the audit flagged. ledger-sort-startkey keys on the ISO date alone, and sort-subr is stable, so a save orders by date and leaves same-day transactions where they were typed. The audit note records both.

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