revert backslash change since fix in next 10.0.4

Author: lindsaylevine

lib/helpers/getPagesManifest.js

@@ -3,14 +3,7 @@ const { readJSONSync } = require("fs-extra");
 const { NEXT_DIST_DIR } = require("../config");
 
 const getPagesManifest = () => {
-  const contents = readJSONSync(
-    join(NEXT_DIST_DIR, "serverless", "pages-manifest.json")
-  );
-  // Next.js mistakenly puts backslashes in certain paths on Windows, replace
-  Object.entries(contents).forEach(([key, value]) => {
-    contents[key] = value.replace(/\\/g, "/");
-  });
-  return contents;
+  return readJSONSync(join(NEXT_DIST_DIR, "serverless", "pages-manifest.json"));
 };
 
 module.exports = getPagesManifest;