chore: fix wrong path in scrolling build config

Fixes a path that wasn't updated in #11481, causing the Bazel build to fail.

Author: crisbeto

src/cdk-experimental/tsconfig-build.json

@@ -30,7 +30,7 @@
   },
   "files": [
     "public-api.ts",
-    "typings.d.ts"
+    "./typings.d.ts"
   ],
   "angularCompilerOptions": {
     "annotateForClosureCompiler": true,