Don't add @mathjax to package name twice

Author: dpvc

components/mjs/input/tex/extension.js

@@ -4,8 +4,7 @@ import {hasWindow} from '#js/util/context.js';
 export function fontExtension(id, name, pkg = `@mathjax/${name}`) {
   if (MathJax.loader) {
     const FONTPATH = hasWindow ? `https://cdn.jsdelivr.net/npm/${name}` : pkg;
-    const path = name.replace(/-font-extension$/, '-extension').replace(/^@.*?\//, '');
-    const extension = name.replace(/-font-extension$/, '');
+    const path = name.replace(/-font-extension$/, '-extension');
     const jax = (MathJax.config?.startup?.output || 'chtml');
     combineDefaults(MathJax.config.loader, 'paths', {[path]: FONTPATH});
     combineDefaults(MathJax.config.loader, 'dependencies', {[`[${path}]/${jax}`]: [`output/${jax}`]});

components/mjs/input/tex/extensions/bbm/bbm.js

@@ -1,4 +1,4 @@
 import './lib/bbm.js';
 import {fontExtension} from '../../extension.js';
 
-fontExtension('[tex]/bbm', '@mathjax/mathjax-bbm-font-extension');
+fontExtension('[tex]/bbm', 'mathjax-bbm-font-extension');

components/mjs/input/tex/extensions/bboldx/bboldx.js

@@ -1,4 +1,4 @@
 import './lib/bboldx.js';
 import {fontExtension} from '../../extension.js';
 
-fontExtension('[tex]/bboldx', '@mathjax/mathjax-bboldx-font-extension');
+fontExtension('[tex]/bboldx', 'mathjax-bboldx-font-extension');

components/mjs/input/tex/extensions/dsfont/dsfont.js

@@ -1,4 +1,4 @@
 import './lib/dsfont.js';
 import {fontExtension} from '../../extension.js';
 
-fontExtension('[tex]/dsfont', '@mathjax/mathjax-dsfont-font-extension');
+fontExtension('[tex]/dsfont', 'mathjax-dsfont-font-extension');