grabValueFrom doesn't work with fillField

test code is:

$I->fillField('username', 'admin');
codecept_debug($I->grabValueFrom('[name=username]'));
$I->click('Login');

run with --debug option, will get output like:

   I grab value from "[name=username]"
  
   I click "Login"

no value ouputed here. notice that the empty line is my expected output location of value.

I found the issue in last line of method CodeCeption\Lib\InnerBrowser::fillField:

$input->getNode(0)->nodeValue = htmlspecialchars($value);

the point is input field must be have no nodeValue, and grabValueFrom use the right way to get value. I think the right code should be like:

$input->getNode(0)->setAttribute('value', htmlspecialchars($value));

I tried to change to this, it works

I think a test for CodeCeption\Lib\InnerBrowser will be good.

Could you make a pull request?

My pleasure

#3873 PR created

fix Codeception#3866 grabValueFrom doesn't work

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