Fixed e2e tests for HMR

Summary:HMR e2e test red-screened because of the wrong path to react.

**Test plan (required)**

Make sure e2e tests pass
Closes https://github.com/facebook/react-native/pull/7209

Reviewed By: mkonicek

Differential Revision: D3218896

Pulled By: bestander

fb-gh-sync-id: 8c5c4ceda34bd2d273e9de16ed670592d1fde3b9
fbshipit-source-id: 8c5c4ceda34bd2d273e9de16ed670592d1fde3b9

package.json

@@ -133,7 +133,7 @@
     "babel-core": "^6.6.4",
     "babel-plugin-external-helpers": "^6.5.0",
     "babel-polyfill": "^6.6.1",
-    "babel-preset-react-native": "^1.5.2",
+    "babel-preset-react-native": "~1.6.0",
     "babel-register": "^6.6.0",
     "babel-types": "^6.6.4",
     "babylon": "^6.6.4",