Fix invalid type of engines during merge result
Engines was stored in set and casted in list, it leads to issue during merge of result. This patch fixes the engines container to a list to be able to use json serialization. Below the error spotted: ``` File "/usr/local/searx/searx/results.py", line 233, in _merge_result duplicated['engines'].add(result['engine']) AttributeError: 'list' object has no attribute 'add' ```
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