test(fixtures): drop derry_duplicate_naming (was a copy-paste artifact)

The release name mixed two distinct releases — not a real-world case
worth anti-regression. SHITTY bucket now holds 14 fixtures (down from 15).

CHANGELOG.md

@@ -28,7 +28,7 @@ callers).
   lowercase `s01e01` (Notre Planète), `NxNN` with ` - ` separators
   (Vinyl, captures dash artifact), title-with-year-suffix (Deutschland.83),
   season-range `S01-06` (Tatortreiniger, captures movie misclassification),
-  duplicated title (Derry Girls), bare folder name (Jurassic Park,
+  bare folder name (Jurassic Park,
   media_type=unknown), apostrophe-in-name (Honey Don't, captures full AI-path
   degeneration), SUBS-tag movie (Hook), space separators (Predator Badlands,
   captures group=UNKNOWN), subs-only release (Westworld S04).