vhal should not be applied to horizontal text

[frivoal]

In the following test ref files:

• https://github.com/web-platform-tests/wpt/blob/master/css/css-text/text-spacing-trim/text-spacing-trim-001-ref.html (ref of https://github.com/web-platform-tests/wpt/blob/master/css/css-text/text-spacing-trim/text-spacing-trim-001.html)
• https://github.com/web-platform-tests/wpt/blob/master/css/css-text/text-spacing-trim/text-spacing-trim-dot-001-ref.html (ref of https://github.com/web-platform-tests/wpt/blob/master/css/css-text/text-spacing-trim/text-spacing-trim-dot-001.html)
• https://github.com/web-platform-tests/wpt/blob/master/css/css-text/text-spacing-trim/text-spacing-trim-colon-001-ref.html (ref of https://github.com/web-platform-tests/wpt/blob/master/css/css-text/text-spacing-trim/text-spacing-trim-colon-001.html)

The vhal feature is applied all the time, but I believe it should only be applied in the vertical variant of the test. In other words, unless I am missing something, instead of

halt {
  font-feature-settings: 'halt' 1, 'vhal' 1;
}

we should have

halt {
  font-feature-settings: 'halt' 1;
}
.vrl halt {
  font-feature-settings: 'halt' 1, 'vhal' 1;
}

cc: @kojiishi @fantasai