Rename sans-serif CSS class into sans-serif-fonts to match the JS setting, allowing to simplify JS code

src/librustdoc/html/static/css/rustdoc.css

@@ -64,7 +64,7 @@ xmlns="http://www.w3.org/2000/svg" fill="black" height="18px">\
 		<path d="M3,5h16M3,11h16M3,17h16" stroke-width="2.75"/></svg>');
 }
 
-:root.sans-serif {
+:root.sans-serif-fonts {
 	--font-family: "Fira Sans", sans-serif;
 	--font-family-code: "Fira Mono", monospace;
 }

src/librustdoc/html/static/js/settings.js

@@ -44,12 +44,6 @@
                 }
                 break;
             case "sans-serif-fonts":
-                if (value === true) {
-                    addClass(document.documentElement, "sans-serif");
-                } else {
-                    removeClass(document.documentElement, "sans-serif");
-                }
-                break;
             case "hide-sidebar":
             case "hide-toc":
             case "hide-modnav":

src/librustdoc/html/static/js/storage.js

@@ -319,9 +319,6 @@ updateTheme();
 if (getSettingValue("source-sidebar-show") === "true") {
     addClass(document.documentElement, "src-sidebar-expanded");
 }
-if (getSettingValue("sans-serif-fonts") === "true") {
-    addClass(document.documentElement, "sans-serif");
-}
 (function() {
     const settings = [
         "hide-sidebar",
@@ -329,6 +326,7 @@ if (getSettingValue("sans-serif-fonts") === "true") {
         "hide-modnav",
         "word-wrap-source-code",
         "hide-deprecated-items",
+        "sans-serif-fonts",
     ];
     for (const setting of settings) {
         if (getSettingValue(setting) === "true") {