Fix openId account login via mail app failed issue

If user wants to login to openId acocunt (ex: google, yahoo), it jumps
from mail app -> accountManager app -> browser app on the authorization
stage. On this jumping causes accountManager to be cleared out, so
`onActivityResult` is failed to be called perfectly. To resolve this,
insead of calling via onActivityResult, we pass pendingIntntent to
AppAuth library to re-open accountManager when the authorization stage
from browser is done.