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

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

quartz/components/PageTitle.tsx

@@ -1,11 +1,12 @@
 import { pathToRoot } from "../util/path"
 import { QuartzComponentConstructor, QuartzComponentProps } from "./types"
+import { classNames } from "../util/lang"
 
 function PageTitle({ fileData, cfg, displayClass }: QuartzComponentProps) {
   const title = cfg?.pageTitle ?? "Untitled Quartz"
   const baseDir = pathToRoot(fileData.slug!)
   return (
-    <h1 class={`page-title ${displayClass ?? ""}`}>
+    <h1 class={classNames(displayClass, "page-title")}>
       <a href={baseDir}>{title}</a>
     </h1>
   )