Settings inconsistencies in the video section

Description

The 3 first settings in the video section have different behaviors.

OP: https://forum.videolan.org/viewtopic.php?f=35&t=163895

• Save audio delay -> saves the delay as metadata for each video
• Save brightness level -> saves the brightness level when the user changes it ans restore it for next playbacks (doesn't depend on the video played)
• Save playback speed -> each time the speed is changed, it will be restored if the media doesn't already have a speed set

Expected behavior

Same behavior or better explanations

Screenshot / video

Context

App version

Android version

Device model

App mode

Smartphone

TV

Auto