[yamllint] tests/unit/settings/user_settings.yml

Fixed messages reported by::

    make test.yamllint

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

tests/unit/settings/user_settings.yml

@@ -1,5 +1,5 @@
 general:
-    debug : False
+  debug: false
   instance_name: "searx"
 
 search:
@@ -13,8 +13,8 @@ server:
   port: 9000
   bind_address: "0.0.0.0"
   secret_key: "user_settings_secret"
-    base_url : False
-    image_proxy : False
+  base_url: false
+  image_proxy: false
   http_protocol_version: "1.0"
   method: "POST"
   default_http_headers: