Remove seedWords from UI state dump.

ui/app/reducers.js

@@ -42,6 +42,10 @@ function rootReducer (state, action) {
 }
 
 window.logState = function () {
-  var stateString = JSON.stringify(window.METAMASK_CACHED_LOG_STATE, null, 2)
+  var stateString = JSON.stringify(window.METAMASK_CACHED_LOG_STATE, removeSeedWords, 2)
   console.log(stateString)
 }
+
+function removeSeedWords (key, value) {
+  return key === 'seedWords' ? undefined : value
+}