chore(french): novhell drop Accept-Encoding override

[Balrog57]

Checklist

• Update version code if an existing plugin was modified (1.0.4 -> 1.0.5)
• Test changes in Plugin Playground or the app (live-check + on-device below)
• Commit messages follow type(scope): description

Context

Reported symptom: opening a Novhell novel in the app shows no chapters, while the WebView renders fine. I investigated but could not reproduce it:

• Emulator + app v2.1.0 + plugin v1.0.4 (official code): Tempest of the Stellar War opens with 393 chapters.
• 
  ode scripts/live-check-plugin.js-equivalent harness: all PASS (5 novels, 393 chapters, chapter body 15805 chars); all 5 novels parse (244-452 chapters) and sampled first/middle/last chapters return 11k-28k chars.
• Cloudflare answers plain HTML (identity) to \Accept-Encoding: deflate\ even with the exact app headers over HTTP/1.1 and HTTP/2, so the override is harmless on the tested path.

So this PR does not claim to fix that report - the cause is still unknown (possibly IP-based bot challenge on the reporter's network, or a stale installed plugin).

What this PR does

Removes the anomalous \Accept-Encoding: deflate\ override from \getCheerio\ so the app default headers (\gzip, deflate\ + Android User-Agent, see \src/plugins/helpers/fetch.ts) apply - the same as every other non-French plugin in the repo. A manually-set \Accept-Encoding\ disables transparent response decompression on Android (OkHttp), so the override is a latent 0-chapter risk with zero benefit.

Tests

• Live-check harness with the default-header path: all PASS (popular 5, search 1, parseNovel 393 chapters, parseChapter 15805 chars).
• On-device (emulator, app v2.1.0): updated installed plugin 1.0.4 -> 1.0.5 via local repository manifest, reopened the novel - still 393 chapters, no regression.
• \ sc\ (ES5 production config) and eslint pass.

[Balrog57]

Closing: could not reproduce on emulator (app v2.1.0 + plugin v1.0.4 shows 393 chapters on test network). Keeping this as an unproven cleanup would be noise; will reopen with evidence if the root cause is identified.