Brave engine: fix BrotliDecoderDecompressStream error

searx/settings.yml

@@ -1865,6 +1865,8 @@ engines:
       year: 'py'
     categories: [general, web]
     disabled: true
+    headers:
+      Accept-Encoding: gzip, deflate
     about:
       website: https://brave.com/search/
       wikidata_id: Q107355971