go.tools/dashboard: Fix incorrect parsing of log hash.
go.tools/dashboard: Fix incorrect parsing of log hash.

R=adg
CC=golang-dev
https://codereview.appspot.com/43000043

webfd/go-zh.tools,d0f/go-zh.tools,d0f/go-zh.tools,d0f/go-zh.tools,skyportsystems/go.tools,8limbs/gotools,bryanxu/go-zh.tools,bryanxu/go-zh.tools,skyportsystems/go.tools,webfd/go-zh.tools,bryanxu/go-zh.tools,8limbs/gotools,skyportsystems/go.tools,8limbs/gotools,webfd/go-zh.tools,webfd/go-zh.tools,skyportsystems/go.tools,bryanxu/go-zh.tools,skyportsystems/go.tools,d0f/go-zh.tools,d0f/go-zh.tools,bryanxu/go-zh.tools,webfd/go-zh.tools