[fix] route /autocompleter: escape `<` and `>` in the simple theme

This is a follow up of 9a3253fc escaping `<` and `>` in all themes.  This patch
fix issue in oscar theme

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

searx/webapp.py

@@ -916,7 +916,8 @@ def autocompleter():
         suggestions = json.dumps([sug_prefix, results])
         mimetype = 'application/x-suggestions+json'
 
-    suggestions = escape(suggestions, False)
+    if get_current_theme_name() == 'simple':
+        suggestions = escape(suggestions, False)
     return Response(suggestions, mimetype=mimetype)