fix(div): update class name to remove weird space afterwards (#763)

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>

quartz/components/Backlinks.tsx

@@ -1,12 +1,13 @@
 import { QuartzComponentConstructor, QuartzComponentProps } from "./types"
 import style from "./styles/backlinks.scss"
 import { resolveRelative, simplifySlug } from "../util/path"
+import { classNames } from "../util/lang"
 
 function Backlinks({ fileData, allFiles, displayClass }: QuartzComponentProps) {
   const slug = simplifySlug(fileData.slug!)
   const backlinkFiles = allFiles.filter((file) => file.links?.includes(slug))
   return (
-    <div class={`backlinks ${displayClass ?? ""}`}>
+    <div class={classNames(displayClass, "backlinks")}>
       <h3>Backlinks</h3>
       <ul class="overflow">
         {backlinkFiles.length > 0 ? (