Merge pull request #1235 from dalf/bing_false_ddg_true

disable Bing by default, enable ddg by default

searx/settings.yml

@@ -313,6 +313,7 @@ engines:
   - name: bing
     engine: bing
     shortcut: bi
+    disabled: true
 
   - name: bing images
     engine: bing_images
@@ -479,7 +480,6 @@ engines:
   - name: duckduckgo
     engine: duckduckgo
     shortcut: ddg
-    disabled: true
 
   - name: duckduckgo images
     engine: duckduckgo_images