[mod] disable deezer engine by default

To play content from deezer a account is needed, the majority of the SearXNG
won't have.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/settings.yml

@@ -407,6 +407,7 @@ engines:
   - name: deezer
     engine: deezer
     shortcut: dz
+    disabled: true
 
   - name: deviantart
     engine: deviantart