Kitty doesn't respect fontconfig settings anymore

[dtcyganok]

Describe the bug
After v0.36.0 has been released kitty stopped respecting fontconfig OpenType font features settings.

To Reproduce
Steps to reproduce the behavior:

1. Edit ~/.config/fontconfig/fonts.conf:

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
<fontconfig>
  <match target="font">
    <test name="family">
      <string>JetBrains Mono</string>
    </test>
    <edit name="fontfeatures" mode="assign">
      <string>calt off</string>
      <string>zero</string>
      <string>cv06</string>
      <string>cv07</string>
      <string>cv08</string>
    </edit>
  </match>
</fontconfig>

2. Run kitty kitty --config NONE
3. See that the font features settings haven't been applied

[tuananh]

i thought im going crazy :D