vds-time-slider should update while scrubbing

[ghost]

When scrubbing through the video using TimeSlider (I'm using React if that matters) the --vds-slider-fill-percent css var isn't updated until I lift the mouse button.

[BlakeB415]

You can get around this issue by using this css

vds-time-slider[dragging] .slider-track.fill {
	width: var(--vds-pointer-percent);
}

This makes it use the cursor pointer percent while dragging.

[mihar-22]

We'll be implementing a separate track for seeking while dragging. I'll open a new issue up for it.