[css-fonts] Fix bad merge in 735ec41

Author: litherum

css-fonts-4/Overview.bs

@@ -6878,7 +6878,6 @@ a single value.
 The <code id="cssfontpalettevaluesrule2">CSSFontPaletteValuesRule</code> interface</h3>
 <pre class='idl'>[Exposed=Window]
 interface CSSFontPaletteValuesRule : CSSRule {
-  readonly attribute CSSOMString basePalette;
   readonly attribute CSSOMString name;
   readonly attribute CSSOMString fontFamily;
   readonly attribute CSSOMString basePalette;