Clear old seed words when importing new seed words

ui/app/actions.js

@@ -413,7 +413,12 @@ function createNewVaultAndRestore (password, seed) {
     log.debug(`background.createNewVaultAndRestore`)
 
     return new Promise((resolve, reject) => {
-      background.createNewVaultAndRestore(password, seed, err => {
+      background.clearSeedWordCache((err) => {
+        if (err) {
+          return reject(err)
+        }
+
+        background.createNewVaultAndRestore(password, seed, (err) => {
           if (err) {
             return reject(err)
           }
@@ -421,6 +426,7 @@ function createNewVaultAndRestore (password, seed) {
           resolve()
         })
       })
+    })
       .then(() => dispatch(actions.unMarkPasswordForgotten()))
       .then(() => {
         dispatch(actions.showAccountsPage())