go.talks/present: include correct play.js in article template
go.talks/present: include correct play.js in article template

R=golang-dev
CC=golang-dev
https://golang.org/cl/6949064

Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks