Revert "gnu: sdcv: Add 'STARDICT_DATA_DIR' search path spec."

This reverts commit 7dd1a2174a.
It has been reported, that this patch does not work as intended.
See <https://bugs.gnu.org/45645>.

gnu/packages/dictionaries.scm

@@ -438,12 +438,6 @@ (define-public sdcv
        ("ncurses" ,ncurses)
        ("readline" ,readline)
        ("zlib" ,zlib)))
-    ;; If you use Guix to package and install dictionary data,
-    ;; you need this variable to load them.
-    (native-search-paths
-     (list (search-path-specification
-            (variable "STARDICT_DATA_DIR")
-            (files '("share/stardict/dic")))))
     (home-page "https://dushistov.github.io/sdcv/")
     (synopsis "Console version of StarDict")
     (description "sdcv is simple text-based utility for work with dictionaries