fix: duplicate init_logging call

[EffortlessSteven]

Problem

init_logging(cli.verbose, cli.debug) is called twice in crates/diffguard/src/main.rs at lines 589 and 592. The second call is redundant.

Fix

Remove one of the two calls.

Source

PR #5 review — Gemini (comment #3) and CodeRabbit (comment #28).

[EffortlessSteven]

Fixed in commit b8e2532 (PR not needed, already merged to main via push).