fix: let the tech preload auto on its own

[brandonocasey]

Description

This was found due to the work done in #4660. Basically we reload the video element twice on every source with preload set to auto. This can potentially cause the same data to be downloaded twice.

Specific Changes proposed

• remove players call to load, as tech should handle preload on its own, and this is harmful for the html5 tech.

Requirements Checklist

• Feature implemented / Bug fixed
• Reviewed by Two Core Contributors

[brandonocasey]

This currently fires two sourcesets:

video.js/test/unit/sourceset.test.js

Lines 166 to 178 in d7f45ba

	QUnit.skip('player.src({...}) preload auto', function(assert) {
	const done = assert.async();
	this.mediaEl.setAttribute('preload', 'auto');
	this.player = videojs(this.mediaEl);
	this.player.one('sourceset', () => {
	validateSource(assert, this.player, [this.testSrc]);
	done();
	});
	this.player.src(this.testSrc);
	});

[brandonocasey]

Since sourceset is now in master I made the skipped tests run again.

[gkatsev]

I'm still a bit concerned about potential side-effects of this, though, since sourceset is feature-flagged currently, we can limit its affect.

[gkatsev]

what about skipping this is enableSourceset is set?

[gkatsev]

this indent is interesting. I think it was dedented so that it lines up with the this.ready call, not sure if it's necessary or not. Maybe we want to make a new line for the arg and have the comment directly above the arg?

[brandonocasey]

I think we may be better off testing if this causes breakage with some QA, but if we just want to do it later we could put it behind the enableSourceset flag.

[pagarwal123]

QA-LGTM