[enh] google: add filter=0 to Google engine for more results

backport from searx ( 23b3b56a06ef831af0a1b30a12c26ebd50e329bb )

searx/engines/google.py

@@ -298,6 +298,7 @@ def request(query, params):
         'ie': "utf8",
         'oe': "utf8",
         'start': offset,
+        'filter': '0',
         **additional_parameters,
     })