fix logic for appending %s to searchUrl
fix logic for appending %s to searchUrl

gdh1995/vimium,smblott-github/vimium,philc/vimium,philc/vimium,decaffeinate-examples/vimium,gdh1995/vimium,decaffeinate-examples/vimium,smblott-github/vimium,smblott-github/vimium,poacher2k/vimium,poacher2k/vimium,gdh1995/vimium,poacher2k/vimium,decaffeinate-examples/vimium,philc/vimium