LPS-46863 - Sign in modal should display

https://issues.liferay.com/browse/LPS-46863

Hey Nate, These changes should make the sign in modal display in bs3. [My notes](https://www.evernote.com/shard/s241/sh/df883ee5-737b-4e8d-9fd9-14945948d181/cc853186d0b8ffa4445912a0c04d0f42)