Remove license entry for old speedreader repo (fixes brave/brave-brow…

…ser#9939)

This repo was removed in 1ff745a
and merged into brave-core proper so it is covered by the main
license.

script/brave_license_helper.py

@@ -129,11 +129,6 @@ def AddBraveCredits(prune_paths, special_cases, prune_dirs, additional_paths):
             "URL": "https://github.com/brave/Sparkle",
             "License": "MIT",
         },
-        os.path.join('brave', 'vendor', 'speedreader_rust_ffi'): {
-            "Name": "speedreader-rust-ffi",
-            "URL": "https://github.com/brave-experiments/speedreader-rust-ffi",
-            "License": "MPL-2.0",
-        },
     })
 
     # Don't recurse into these directories looking for third-party code.