Update fbjs and fbjs-scripts to pull in bug fix
Update fbjs and fbjs-scripts to pull in bug fix

Summary:
**what is the change?:**
Updated the versions of `fbjs` and `fbjs-scripts`

**why make this change?:**
Latest versions include a bug fix[1] that fixes #914

[1]: https://github.com/facebook/fbjs/pull/244

**test plan:**
0) Use `n` to set my local version of node.js to `7.6.0`, with npm
   v4.1.2

1) Ran `yarn upgrade && yarn build` and saw no errors

**issue:**
https://github.com/facebook/draft-js/issues/914
Closes https://github.com/facebook/draft-js/pull/1291

Differential Revision: D5432468

fbshipit-source-id: 2dda1e9efeef662a807c87abb0bab12340c6289f

facebook/draft-js