Adjust horizontal seeking gesture initial step size

[perokhe]

Describe your suggested feature

When dragging horizontally the seek step is initially 3 seconds and then 1 second. It should be 1 second from the first step.

Other details

There is a similar issue in the mpv-android repo with a proposed solution: https://github.com/mpv-android/mpv-android/issues/472

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• [X] I have written a short but informative title.
• [X] If this is an issue with an official extension, I should be opening an issue in the extensions repository.
• [X] I have updated the app to version 0.15.2.4.
• [X] I will fill out all of the requested information in this form.