Cannot revert the colorTemperature applied on tracks using applyConstraints.

[hao li]

## Description

Currently, I'm working on the implementation of colorTemperature of a project, after the implementation I want to revoke the colorTemperature that I applied on it.

## Steps to reproduce

I'm able to change the colorTemperature, initially the colorTemperature is 0 and whiteBalanceMode is 'continuous'. However, after I change the colorTemperature to any allowed value, the whiteBalanceMode is auto changed to 'manual'. I cannot reset the colorTemperature to 0 again because the value is not allowed, neither can I reset the whiteBalanceMode to 'continuous' again with the similar code that I change colorTemperature.

Code:

```

'use strict';

const video = document.querySelector('video');

const canvas = window.canvas = document.querySelector('canvas');

canvas.width = 480;

canvas.height = 360;

const constraints = {

  audio: false,

  video: true,

};

var currTracks = null;

function handleSuccess(stream) {

  const videoTracks = stream.getVideoTracks();

  currTracks = videoTracks;

  window.stream = stream; // make stream available to browser console

  video.srcObject = stream;

}

function handleError(error) {

  console.log('navigator.MediaDevices.getUserMedia error: ', error.message, error.name);

}

async function init(){

  await navigator.mediaDevices.getUserMedia(constraints).then(handleSuccess).catch(handleError);

  await changeEnv(currTracks,3600);

  setTimeout(function(){changeEnv(currTracks,5500)},1000);

}

async function changeEnv(tracks,compen) {

  console.log(tracks,performance.now());

  for (const track of tracks) {

    console.log('curr',track.getSettings());

    console.log('capab',track.getCapabilities());

    if (compen === 3600) {

      await track.applyConstraints({advanced:[{colorTemperature: compen}]});

    } else {

      await track.applyConstraints({advanced:[{whiteBalanceMode: 'continuous'}]});

    }

    console.log('curr',track.getSettings());

  } 

}

init();

```

## Expected results

The white balance mode is reset to continuous.

## Actual results

The white balance mode is still manual.