fix(curriculum): Updated test to allow both slategray and slategrey for border color (freeCodeCamp#58746)

Author: agilan11

curriculum/challenges/english/25-front-end-development/lab-business-card/6690e10ebe2181212abc9652.md

@@ -206,7 +206,10 @@ assert.exists(document.querySelector('p.company + hr'));
 The `hr` elements should have a `1px` dashed top border in `slategray` color.
 
 ```js
-assert.equal(new __helpers.CSSHelp(document).getStyle('hr').getPropVal('border-top'), '1px dashed slategray');
+assert.oneOf(
+  new __helpers.CSSHelp(document).getStyle('hr').getPropVal('border-top'), 
+  ['1px dashed slategray', '1px dashed slategrey']
+);
 ```
 
 After the first `hr` element, there should be a `p` element with an email address as your text.