fix: current time tooltip does not update

[marcosmx]

Description

The progress bar tooltip get stuck and don't update the time as the video plays. It only respond to mouse movements and reflects the time in the current time tool tip.

Specific Changes proposed

Add a reference for the playProgressBar component at seekBar to trigger the update action on every playing and timeupdate event

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[misteroneill]

It looks like this essentially restores this code block from the PR that caused the regression.

Does this.bar not work anymore for some reason?

Regardless, we should probably null check it before calling update(). Generally, it's a good practice not to assume a component exists (the original code had if (this.bar)).

[marcosmx]

@misteroneill
I didn't notice about the presence of property class bar, that's was the reason for not used but I changed the code to use it and validate the null state of it.

[misteroneill]

Changes look good to me. Is there a sensible way to add a test here? If none exists, it may make sense to add some initial progress-control/seek-bar tests.

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