fix(vtex): check for :slug prefix instead of just : in PDP loaders (#1638)

The slug check was too broad, matching any string starting with ":"
instead of specifically checking for the ":slug" placeholder.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: guitavano

vtex/loaders/intelligentSearch/productDetailsPage.ts

@@ -71,7 +71,7 @@ const loader = async (
   const { vcsDeprecated } = ctx;
   const { url: baseUrl } = req;
   const { slug } = props;
-  const haveToUseSlug = slug && !slug.startsWith(":");
+  const haveToUseSlug = slug && !slug.startsWith(":slug");
   let defaultPaths;
 
   if (!haveToUseSlug) {

vtex/loaders/legacy/productDetailsPage.ts

@@ -45,7 +45,7 @@ async function loader(
   const { vcsDeprecated } = ctx;
   const { url: baseUrl } = req;
   const { slug } = props;
-  const haveToUseSlug = slug && !slug.startsWith(":");
+  const haveToUseSlug = slug && !slug.startsWith(":slug");
   let defaultPaths;
   if (!haveToUseSlug) {
     defaultPaths = await PDPDefaultPath({ count: 1 }, req, ctx);