fix: player.loadTech_ incorrect arrow function

[FredZeng]

Description

fullscreenchange, fullscreenerror events triggered by Html5 were not handled as expected by player since some arrow functions missing necessary argument.

Steps to reproduce

1. calling player.requestFullscreen() on any iOS device
2. runing code below to exit fullscreen

function exitfullscreen() {
    if (player.isFullscreen()) {
        player.exitFullscreen();
    }
}

Results

Expected

video can exit fullscreen

Actual

video cannot exit fullscreen

Reason

After entered fullscreen, player.isFullscreen() still remain false.

Specific Changes proposed

None.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[FredZeng]

By the way, might better check L1218 as well.

this.on(this.tech_, 'textdata', (e) => this.handleTechTextData_(e));

[gkatsev]

Thanks!

[misteroneill]

Good catch, thanks!