message: FormField: update css for selects
diff: border-radius: 8px;
  }
  -.FormField[class$="__open"] .FormField__border {
  +.FormField.ChipsSelect__open .FormField__border,
  +.FormField.CustomSelect__open .FormField__border {
  border-radius: 8px 8px 0 0;
  }
  -.FormField[class$="__open--popupDirectionTop"] .FormField__border {
  +.FormField.ChipsSelect__open--popupDirectionTop .FormField__border,
  +.FormField.CustomSelect__open--popupDirectionTop .FormField__border {
  border-radius: 0 0 8px 8px;
  }
  border-radius: 10px;
  }
  -.FormField--ios[class$="__open"] .FormField__border {
  +.FormField--ios.ChipsSelect__open .FormField__border,
  +.FormField--ios.CustomSelect__open .FormField__border {
  border-radius: 10px 10px 0 0;
  }
  -.FormField--ios[class$="__open--popupDirectionTop"] .FormField__border {
  +.FormField--ios.ChipsSelect__open--popupDirectionTop .FormField__border,
  +.FormField--ios.CustomSelect__open--popupDirectionTop .FormField__border {
  border-radius: 0 0 10px 10px;
  }
  height: 200%;
  }
  - .FormField--ios[class$="__open"] .FormField__border {
  + .FormField--ios.ChipsSelect__open .FormField__border,
  + .FormField--ios.CustomSelect__open .FormField__border {
  border-radius: 20px 20px 0 0;
  }
  - .FormField--ios[class$="__open--popupDirectionTop"] .FormField__border {
  + .FormField--ios.ChipsSelect__open--popupDirectionTop .FormField__border,
  + .FormField--ios.CustomSelect__open--popupDirectionTop .FormField__border {
  border-radius: 0 0 20px 20px;
  }
  }
  height: 312.5%;
  }
  - .FormField--ios[class$="__open"] .FormField__border {
  + .FormField--ios.ChipsSelect__open .FormField__border,
  + .FormField--ios.CustomSelect__open .FormField__border {
  border-radius: 31.25px 31.25px 0 0;
  }
  - .FormField--ios[class$="__open--popupDirectionTop"] .FormField__border {
  + .FormField--ios.ChipsSelect__open--popupDirectionTop .FormField__border,
  + .FormField--ios.CustomSelect__open--popupDirectionTop .FormField__border {
  border-radius: 0 0 31.25px 31.25px;
  }
  }
  border-radius: 6px;
  }
  -.FormField--vkcom[class$="__open"] .FormField__border {
  +.FormField--vkcom.ChipsSelect__open .FormField__border,
  +.FormField--vkcom.CustomSelect__open .FormField__border {
  border-radius: 6px 6px 0 0;
  }
  -.FormField--vkcom[class$="__open--popupDirectionTop"] .FormField__border {
  +.FormField--vkcom.ChipsSelect__open--popupDirectionTop .FormField__border,
  +.FormField--vkcom.CustomSelect__open--popupDirectionTop .FormField__border {
  border-radius: 0 0 6px 6px;
  }
  