add missing parameter to gigablast search url
add missing parameter to gigablast search url

Closes #1293

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