Remove blockFinishTime from local storage in destroyIdentityFromLocalStorage

Closes dashboard#620

Remove blockFinishTime from localStorage when clearing local identities, because after this, in order to restore your account, you should enter pin code from sms/email.

javascript/src/utilities/appUtility.js

@@ -82,6 +82,7 @@ export function destroyIdentityFromLocalStorage(key) {
   localStorage.removeItem(key);
   localStorage.removeItem("profiles/" + key);
   localStorage.removeItem("colors/" + key);
+  localStorage.removeItem("blockFinishTime");
 
   let serializedIdentitiesList = localStorage.getItem("identities");