[fix] change duckduckgo url to avoid error response
[fix] change duckduckgo url to avoid error response

jcherqui/searx,dalf/searx,dalf/searx,jcherqui/searx,asciimoo/searx,asciimoo/searx,jcherqui/searx,dalf/searx,asciimoo/searx,asciimoo/searx,jcherqui/searx,dalf/searx