feat(patch): Always show seekbar in bottom of fullscreen Option

[fortissimo247]

Application

YouTube (com.google.android.youtube)

Issue

It is inefficient to tap each time to check the progress of the video in fullscreen.

Patch

I want patch the adding option that always show seekbar in fullscreen like above picture.

Motivation

I just think it will be useful.

Acknowledgements

• [X] I have searched the existing issues and this is a new and no duplicate or related to another open issue.
• [X] I have written a short but informative title.
• [X] I filled out all of the requested information in this issue properly.