[x/tour] go-tour: add semicolons removed accidnetally by gofmt
[x/tour] go-tour: add semicolons removed accidnetally by gofmt

LGTM=adg
R=adg
CC=golang-codereviews
https://golang.org/cl/148990046
X-Tour-Commit: 07a2ce422150cc825eb857921608183d61aa917f

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website